You asked for it, we're delivering - all new remixes, lost, beta & wip tracks, extended tracks and more! 134 tracks!
Music from any future content will be added to this soundtrack (whenever possible).
Tracklist:

A Hat in Time B-Side - 01 Main Theme (Remix) VGR
A Hat in Time B-Side - 02 Through Time and Space (Main Theme Remix) Gario
A Hat in Time B-Side - 03 Scootin' Through My Subconscious Mind (Scootin' Through Subcon Forest Remix) Chimpazilla
A Hat in Time B-Side - 04 I Am Bird (You Are Now Legally a Bird Remix) Theory Of N
A Hat in Time B-Side - 05 Picture Perfect B-Side (Remix) Pascal Michael Stiefel
A Hat in Time B-Side - 06 Scootin' Thru Mafia Town (Remix) LongBoxofChocolate
A Hat in Time B-Side - 07 The Lava Cake Peak (Remix) Julia Henderson
A Hat in Time B-Side - 08 Freight Car Frenzy (Train Rush Remix) Jasper
A Hat in Time B-Side - 09 Sand 'n Sails Heatgusts (Remix) Carlos Eiene
A Hat in Time B-Side - 10 You Are All Bad Guys (Remix) Laura Platt
A Hat in Time B-Side - 11 Subcon Village B-Side (Remix) Echorobot
A Hat in Time B-Side - 12 Mafia Town 8 Bit (Remix) Pascal Michael Stiefel
A Hat in Time B-Side - 13 Sand 'n Sails Village
A Hat in Time B-Side - 14 Sand 'n Sails Heatgusts
A Hat in Time B-Side - 15 Sand 'n Sails Cave Rave
A Hat in Time B-Side - 16 Alpine Skyline's Lazy Paw Gang
A Hat in Time B-Side - 17 Alpha Trailer Theme
A Hat in Time B-Side - 18 Alpha Trailer Theme Ragtime Remix
A Hat in Time B-Side - 19 Beta File Select
A Hat in Time B-Side - 20 Beta Credits Teme
A Hat in Time B-Side - 21 Alpha Bookstore Theme by MP2
A Hat in Time B-Side - 22 Fox Mask Theme
A Hat in Time B-Side - 23 Fox Mask Theme (Oompah Oompah Remix)
A Hat in Time B-Side - 24 Wowl Band Practice Tune
A Hat in Time B-Side - 25 Early Mafia Town Sketch (Making Of Insight)
A Hat in Time B-Side - 26 New Dog Adventure
A Hat in Time B-Side - 27 Welcome To Mafia Town Full Length
A Hat in Time B-Side - 28 Welcome To Mafia Town Beach Full Length
A Hat in Time B-Side - 29 Welcome To Mafia Town Underwater Variation
A Hat in Time B-Side - 30 Mafia Town Is Asleep Underwater Variation
A Hat in Time B-Side - 31 Umbrella Mafia Chase
A Hat in Time B-Side - 32 Cheating The Race
A Hat in Time B-Side - 33 She Came From Outer Space Phase 1
A Hat in Time B-Side - 34 She Came From Outer Space Phase 2
A Hat in Time B-Side - 35 She Came From Outer Space Phase 3
A Hat in Time B-Side - 36 She Came From Outer Space Phase 4
A Hat in Time B-Side - 37 She Came From Outer Space Phase 5
A Hat in Time B-Side - 38 The Big Parade Low Key Variation
A Hat in Time B-Side - 39 Subcon Forest Off Path Variation
A Hat in Time B-Side - 40 Subcon Forest On Path Variation
A Hat in Time B-Side - 41 Subcon Forest Swamp Variation
A Hat in Time B-Side - 42 Close To Toilet Of Doom
A Hat in Time B-Side - 43 Alpine Skyline Hub Mountain Full Length
A Hat in Time B-Side - 44 Alpine Skyline Bird House Variation
A Hat in Time B-Side - 45 Alpine Skyline Lava Cake Path Variation
A Hat in Time B-Side - 46 Alpine Skyline Twilight Bell Path Variation
A Hat in Time B-Side - 47 Alpine Skyline Windmill Path Variation
A Hat in Time B-Side - 48 The Birdhouse Peak Full Length
A Hat in Time B-Side - 49 The Birdhouse Peak Bomb Enemy Variation
A Hat in Time B-Side - 50 The Birdhouse Peak Indoor Variation
A Hat in Time B-Side - 51 The Birdhouse Peak The Fat Bird Variation
A Hat in Time B-Side - 52 The Lava Cake Lowkey Variation
A Hat in Time B-Side - 53 The Twilight Bell Peak Lowkey Variation
A Hat in Time B-Side - 54 The Twilight Bell Peak Part 1
A Hat in Time B-Side - 55 The Twilight Bell Peak Part 2
A Hat in Time B-Side - 56 Judge, Jury and Executioner Outside Variation
A Hat in Time B-Side - 57 Final Boss Defeated
A Hat in Time B-Side - 58 A New Friend in Mafia Town Variation
A Hat in Time B-Side - 59 Time Rift Story Book
A Hat in Time B-Side - 60 Cutscene Intro Cutscene Music Sleeping Scene Music
A Hat in Time B-Side - 61 Cutscene Intro Cutscene Music Music Monitor Scene
A Hat in Time B-Side - 62 Cutscene Intro Cutscene Music Music Scary Ambience
A Hat in Time B-Side - 63 Cutscene Intro Cutscene Music Window Scene
A Hat in Time B-Side - 64 Cutscene Mafia HQ Cutscene Music Timepiece Truth
A Hat in Time B-Side - 65 Cutscene Mafia HQ Cutscene Music Turn Evil
A Hat in Time B-Side - 66 Cutscene Mafia HQ Cutscene Music Leaving
A Hat in Time B-Side - 67 Level Intro Mafia Town
A Hat in Time B-Side - 68 Level Intro Battle Of The Birds
A Hat in Time B-Side - 69 Level Intro Subcon Forest
A Hat in Time B-Side - 70 Level Intro Alpine Skyline
A Hat in Time B-Side - 71 Level Intro Sands & Sails
A Hat in Time B-Side - 72 Level Intro Timerifts
A Hat in Time B-Side - 73 Loading Screen Mafia Town
A Hat in Time B-Side - 74 Loading Screen Battle Of The Birds
A Hat in Time B-Side - 75 Loading Screen Subcon Forest
A Hat in Time B-Side - 76 Loading Screen Sands & Sails
A Hat in Time B-Side - 77 Jingle Gears for Breakfast Logo
A Hat in Time B-Side - 78 Jingle Mafia HQ Entrance
A Hat in Time B-Side - 79 Jingle She's On Her Way
A Hat in Time B-Side - 80 Jingle She's Coming Closer
A Hat in Time B-Side - 81 Jingle She's Here
A Hat in Time B-Side - 82 Jingle She Caught You
A Hat in Time B-Side - 83 Jingle Drowning
A Hat in Time B-Side - 84 Jingle Time Piece Get
A Hat in Time B-Side - 85 Jingle Time Piece Ball Collected
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A Hat in Time B-Side - 86 Bon Voyage!
A Hat in Time B-Side - 87 Ship Shape
A Hat in Time B-Side - 88 Rock The Boat
A Hat in Time B-Side - 89 Everyone Rescued
A Hat in Time B-Side - 90 Deep Sea Rift
A Hat in Time B-Side - 91 Tour Rift Spaceship
A Hat in Time B-Side - 92 Tour Rift Mafia Town
A Hat in Time B-Side - 93 Tour Rift Battle Of The Birds
A Hat in Time B-Side - 94 Tour Rift Subcon Forest
A Hat in Time B-Side - 95 Tour Rift Alpine Skyline
A Hat in Time B-Side - 96 Tour Rift Time's End
A Hat in Time B-Side - 97 Tour Rift Attic
A Hat in Time B-Side - 98 Twilight Travels Rift
A Hat in Time B-Side - 99 Rythm Jump Studio Rift
A Hat in Time B-Side - 100 Peace and Tranquility
A Hat in Time B-Side - 101 Collapsing Rift
A Hat in Time B-Side - 102 Beat The Heat
A Hat in Time B-Side - 103 Security Breach
A Hat in Time B-Side - 104 Wound-up Windmill
A Hat in Time B-Side - 105 Bird Sanctuary
A Hat in Time B-Side - 106 Death Wish Anticipation
A Hat in Time B-Side - 107 Death Wish
A Hat in Time B-Side - 108 Killing Two Birds Anticipation
A Hat in Time B-Side - 109 Killing Two Birds
A Hat in Time B-Side - 110 Mustache Girl EX Anticipation
A Hat in Time B-Side - 111 Mustache Girl EX
A Hat in Time B-Side - 112 Deathwish Timepiece Released
A Hat in Time B-Side - 113 The Arctic Cruise Level Intro Jingle
A Hat in Time B-Side - 114 Death Wish Level Intro Jingle
A Hat in Time B-Side - 115 Death Wish Loading Jingle
A Hat in Time B-Side - 116 Death Wish Death Jingle
A Hat in Time B-Side - 117 Death Wish Time Piece Get Jingle
A Hat in Time B-Side - 118 The Arctic Cruise Time Piece Get Jingle
A Hat in Time B-Side - 119 Dreamy Clocktowers Bonus Track
A Hat in Time B-Side - 120 Alpine Skyline Bonus Track
A Hat in Time B-Side - 121 Nyakuza Metro
A Hat in Time B-Side - 122 Nyakuza Metro - Green Clean Station
A Hat in Time B-Side - 123 Nyakuza Metro - Bluefin Tunnels
A Hat in Time B-Side - 124 Nyakuza Metro - Pink Paw Station
A Hat in Time B-Side - 125 The Empress
A Hat in Time B-Side - 126 Fast Food
A Hat in Time B-Side - 127 Nyakuza Manholes
A Hat in Time B-Side - 128 Calm Hour
A Hat in Time B-Side - 129 Rush Hour
A Hat in Time B-Side - 130 Rumbi Factory
A Hat in Time B-Side - 131 Nyakuza Metro Level Intro Jingle
A Hat in Time B-Side - 132 Nyakuza Metro Item Get Jingle
A Hat in Time B-Side - 133 Nyakuza Metro Ticket Get Jingle
A Hat in Time B-Side - 134 Nyakuza Metro Timepiece Get Jingle