And now for the nice, refreshing, virtually controversy-free
Poodle Hat. We all know the story of "Hardware Store," the failed style parody of The Presidents of the United States of America that was re-worked into a true original song, so let's move on to the lepers and get the arguing out of the way.
"Party at the Leper Colony" is generally referred to as a Bo Diddley style parody, although other artists are sometimes mentioned. This is because of the prominent drum part, which is of course the famed Diddley beat. But when I listen to Leper Colony, it does not sound like Bo Diddley in any other way. I've discussed this before, but I feel like it's very close musically to Bruce Springsteen's
"She's The One" (after the 1:15 mark or so.) The vocals do follow the pattern of a typical Diddley beat song (everything from "Willie and the Hand Jive" to "I Want Candy.") Maybe it's not enough to call it a Springsteen style parody, but it's more than we have to call it a Diddley style parody.
"Wanna B Ur Lovr" is based on the Midnite Vultures album by Beck, specifically
"Peaches & Cream."
"Why Does This Always Happen to Me?" is a style parody of Ben Folds Five (moreso than Ben's solo stuff, although there's not much difference.) There isn't a lot lifted from specific songs, but it has elements of
"Philosophy," "Song for the Dumped," (NSFW language) and
"Steven's Last Night in Town."
"Bob" is primarily based on "Bob Dylan's 115th Dream" (can't find a video of it that's actually Dylan singing) with the harmonica bursts borrowed from
"Subterranean Homesick Blues" (among others.)
"Genius in France" is a whole bunch of Frank Zappa songs. Check
TheLazenby's list for a good rundown. The real problem with this one is picking a date for it, since it covers a good stretch of Zappa's pop/rock career.