Why did Will Ferell yell aqua-lung at the end of his jazz flute solo in anchorman???

Jethro Tull is a band in which the lead singer Ian Anderson plays flute. The band does not have anyone named Jethro Tull in it, Jethro Tull is the name of some early explorer or something, regardless it's irrelevant. Anyway the bands most famous song is called Aqualung. Famous flute artist, famous song, its funny if you know what Will Ferell is talking about.

In the 70's there was a rock musician named Jethro Tull who also played the flute in most of his songs - "Aqualung" was one of his most popular songs. Personally like him a lot.