If you want a change of music then unlock the following music tracks by completing Tour mode with the indicated character.

Unlock Bonus Track - Bee Stang by Ice Trey:
Using Killer complete Tour mode.

Unlock Bonus Track - Dead To Me:
Using El Suave complete Tour mode.

Unlock Bonus Track - Outlaw Unplugged:
Using Kuki complete Tour mode.

Characters

Unlock Bruce - Beat Luther's Tour mode

Unlock Natasha - Beat Summer's Tour mode

Unlock Sven - Beat Killer's Tour mode

Unlock Kiku - Beat Donna's Tour mode

Unlock Vinny - Beat El Suave's Tour mode

Unlock Shawnee - Beat Sven's Tour mode

Unlock Tommy - Beat Kiku's Tour mode

Unlock Afrodite - Beat Vinny's Tour mode

Unlock Ice Trey - Beat Shawnee's Tour mode

Unlock Harley - Beat Afrodite's Tour mode

Unlock Luther - Beat Ice Trey's Tour mode

Unlock Lizzy - Beat Harley's Tour mode

Unlock Heavy G. - Beat all 16 Tour modes

Unlock Ball Boy - Complete the drills for all 16 characters, plus Heavy G.


Heads and Hats

Tennis-ball Head for Luther:
Beat tTour mode with Luther

Volley-ball Head for Shawnee:
Beat Tour mode with Shawnee

Golf-ball Head for Ice Trey:
Beat Tour mode with Ice Trey

Tennis-ball Head for Bruce:
Beat Tour mode with Bruce

Tennis-ball Hat for Killer:
After you complete the Tour with Killer

Tennis-ball Hat for Sven:
After you complete the tour with Sven


Bonus Courts

Unlock Slaughterhouse:
Complete all drills for any character

Unlock Apocalypse:
Complete all 16 Tour modes