The Fast Lane [UPDATED with Gilbert & Sullivan parodies]

NOTE: This post was originally scheduled for late December, but I've moved it up to commemorate Tom Lehrer's passing. "The Elements" is the fifth clip below.

Some songs have a fast tempo, such as Bob Dylan's "Subterranean Homesick Blues." Little Richard was said to be so annoyed by Pat Boone's down-tempo cover of "Tutti Frutti" that he recorded "Long Tall Sally" so fast that "Pat Boone couldn't sing it." This post is about even faster songs, the ones so challenging that most vocalists won't even try them, and that cannot be slowed down without losing the whole point.

Can't exactly call this one a song, but it might be where Tom Lehrer got the idea:

For comparison:

And the winner for fastest vocal:

UPDATES:

I am the very model of a biblical philologist:

I am the very model of a psychopharmacologist: