It could be a solo, a line being sung, a riff, etc etc..

Guitar solo and the vocals on "Time" by Pink Floyd.

I love the riff on "Band on the Run" during "If we ever get out of here", but especially before, the same Am-D guitar riff (I don't like the last 4 minutes of the song though!)

The piano riff in "Crime of the Century" after the break (Am-F)

The end of Stairway to Heaven, solo and after.

The tenderness of Glenn's voice in the opening verse of TNKIT - including his solo on ICTYW...

The opening piano riff on "Nineteen-Hundred and Eighty-Five"

The guitar riff from "Shine On You Crazy Diamond"

The couplet during "A Day In The Life" when you can't even hear the "F" sound in the couplet.. The tenderness, but also the vibrato, trill.

"... had to laugh"
"... photograph"

I'll come back to this as I'm busy, but I didn't wanna forget, and I can't wait to read your responses