ok so im thinking here
recently for AAA titles
FFX13 (1, 2 and 3) games all had tracks with CLEARLY recognizable english lyrics. FFX13-2 was teh weirdest with the jpop and jrap stuff like "so you want to ride my chocobo?" and some of the weird jmetal stuff for bosses.
older game
PS1, chrono cross had various tracks with full vocals, and once again mainly during boss fights.
anyways, it can work, but the music needs to fade or at least be managed if the characters have to speak.
remember tales of xillia?
"FRESH MUTTON" could sometimes, randomly overcome what the characters were saying DURING CUT SCENES.
