The only record i have is destroy all astromen.For this record:In "pop corn" crabula you hear someone talking here and there,"Joker's Wild" has a vocal intro,In "mystery meat" there is a guy talking again,"Heavies" and "Madness in the strees" have a vocal intro too,"Mystery science 300 love theme" is a real song with lyrics and stuff."Landlocked has a vocal intro,"gargantua's last stand" has a vocal intro."Destination Venus" is a song with vocals like "mystery science......",and "the shadow know has just another vocal intro.
To sum up only "Mystery....." and "Destination Venus" have "real" vocals,and they are pretty awesome songs too.Hope i helped.