I don't see it noted, but the three songs from the PS2 game Cowboy Bebop: Tsuioku no Serenade are:
M4 "DIAMONDS"
M10 "EINSTEIN GROOVIN'"
M11 "PEARLS"
Those tracks are also featured in instrumental form on this CD:
https://vgmdb.net/album/11804
Those three tracks also appear on this vinyl release, but I'm not sure if they're the vocal or instrumental versions (probably vocal):
https://vgmdb.net/album/102268