A Bronx-based mixing pioneer, John Morales certainly worked with some disco luminaries, and it is these tracks on best-of collection The M&M Mixes that still hit with force. Selections from Curtis Hairston, First Choice, and Universal Robot Band still get people out on the floor at gay disco nights, mostly because of Morales’ use of prominent funk bass and ass-shaking congas. But some other numbers fall flat because their camp value has passed (Bumblebee Unlimited’s “Lady Bug”) or because they’re simply boring, overstretched midtempo tracks (Skyy’s “Because of You”). Sampling Morales’ better work is a must for any disco connoisseur, but it might be more fun to find the original vinyl versions of the more outstanding pieces featured here.