CHRISTOPHER: Hey, I play guitar.
LORELAI: You know the opening lick to Smoke on the Water.
CHRISTOPHER: And I’ve since mastered the opening lick to Jumpin’ Jack Flash.
Smoke on the Water is a 1973 song by English heavy-metal pioneers Deep Purple, from their 1972 album Machine Head; it was written by the band’s guitarist, Ritchie Blackmore. The song retells the true story of when Deep Purple were in Montreux, Switzerland to record an album at the casino in 1971, when the casino caught fire. The “smoke on the water” is the image of the smoke from the fire over Lake Geneva. Smoke on the Water went gold and got to #4 in the US. It is famous for its opening riff, which is often chosen as a piece by beginner guitarists, although playing it correctly is actually fairly difficult, and most learners opt for a simpler power chord version. This may be what Christopher did as well.
Jumpin’ Jack Flash is a 1968 song by English rock band The Rolling Stones, released as a single. It was written by Mick Jagger and Keith Richards, but Bill Wyman claims it was he who wrote the famous opening riff, and remained uncredited for it. Jumpin’ Jack Flash went to #1 in the UK and #3 in the US, and is one of the band’s most popular songs, often covered by other performers and featured in films.