This was a thing I did for myself, as I just replaced songs with random ones I liked and thought would fit, but I decided to upload it cuz why not, so here it is:

Isolated Fight (Kiryu's battle theme) - Modern Crusaders, Enigma
Hailstorm (Saejima's battle theme) - 8 Mile, Eminem
Affected Fight (Akiyama's battle theme) - Don't Stop till You Get Enough, Michael Jackson
What a FUNKASTIC hit (Shinada's battle theme) - Delírios, FBC

Regular Boss - Guardian of Despair (LAD:IW) (i think)
Regular Long Battle 1 - Abyss of Time (TEKKEN Tag 2)
Regular Long Battle 2 - Plucking Tulips (TEKKEN Tag 2)
Kamuro Hills Long Battle 1 - Karma 1st (TEKKEN 6)
Kamuro Hills Long Battle 2 - Karma 2nd (TEKKEN 6)
Crowd Boss - Sky Should be High (GGXrd)
Tojo Clan Battle - Receive and Believe You (LAD:IW)
Kuroha Family Battle - Multi-Man Smash (SSBU)
Arena Round 1 - Jaki (LADG)
Arena Finals - Heaven's Gate (LADG)
Victory Road Qualifiers - HUMBLE, Kendrick Lamar
Chase Theme - Say No Go, De La Soul
Baba's theme - Fist Law (Y6)
Kanai's theme - M. Bison's Theme (SF4)
Watase's / Katsuya's theme - Dark Skies [instrumental] (MGR)
Kiryu's / Saejima's theme - A Soul Can't Be Cut (MGR)
Majima's Theme - Receive and Bite You + notyoshi's remix (Y4)
Baba's Final Theme - KONNAN Janai concert (Y5)
Kanai's Final Theme - Desperate Struggle (TEKKEN 7, SSBU remix)
Aizawa's Theme - Deadly Struggle [Dual Mix] (LADG + Vincent Moretto's cover)

I think there are some others I forgot but whatever, have fun finding out