LMAO! MANNY PACQUIAO GETS SUED FOR $10 MILLION OVER MUSIC! DON'T GIVE UP YA DAY JOB MANNY CAUSE YOU CAN'T HOLD A F**KING NOTE!

RBM Group International filed a lawsuit today against Manny in L.A. County Superior Court -- alleging the pound-for-pound boxing champ signed a contract in 2009 in which he promised to record 12 songs ... but never did.

In the docs, RBM claims they wrote Pacquiao a $40,000 check in October of '09 -- which he deposited -- in return for the first two songs ... but the boxer has refused to record the music.

RBM claims they're out of pocket $200,000 ... and they've lost profits in the amount of $10 mil.

Calls to Manny's people have not been returned.