For me it was Bad Religion lyrics. 13 year old me would sit down in front of the CD player, booklet in one hand, dictionary in the other. Greg Graffin uses an obscene amount of vocabulary that I haven't encountered anywhere else.

One example:

The masses are obsequious, contented in their sleep. The vortex of their minds ensconced within the murky deep

Try The Hitchhiker's Guide to the Galaxy. It's pretty cool and has some very complex sentences