"Hot Rats" is my favorite, mostly for "Willie The Pimp" -- my favorite Zappa tune ever. Sugarcane Harris' electric violin is sublime. The rest of the album is instrumental, showing Zappa's talent as a composer. Even if the instrumentals don't float your boat this is a must have album for the afrementioned track. Kind of like getting the soundtrack to "Performance" only for "Memo From Turner" (although there are many other tracks I like on this platter). "I'm a little pimp with my hair gassed back, pair of kahki pants and my shoe shine black..." -- can you hear it?
