[Slings and Arrows]

It was chosen ahead of the opening riff from Sweet Child O' Mine by Guns N' Roses.

That's not a solo; that's a riff. The best riffs/hooks of all time is another matter entirely, and arguably a more interesting one.

[wally-balls]

I don't know if it's an extended riff or a solo, but any list that doesn't have Crazy Train in its top 5 (in my opinion #1) isn't worth a second's consideration

[safeasthebanks]

"The best riffs/hooks of all time is another matter entirely, and arguably a more interesting one."

Good point. And in my humble opinion, while I can understand none of their songs being on the "solo" list, I feel that a riff/hook list would have to have more than a few songs from AC/DC.