Matthew Wilkening

For a while, if a track appeared on one of their LPs, you could be confident it would also turn up onstage.

In addition to vocals, frontman played guitar and served as video's cameraman.

Song helped keep Chicago sessions from being a total waste.

"At some point, Axl, it's gotta be good enough."

Hard-to-find, extras-laden set is valued at $125.

"It's good that people recognize these things as dangerous," singer said.

The song helps one of the movie's heroes escape certain death.

Guitarist took lead-vocal duties for the first time on a band song.

"I honor my dad by existing and doing what I do every day."

Everly was one-half of a duo that influenced the Beatles, Byrds and Simon & Garfunkel.