Phil Collins, “Behind the Lines” (1981)

I recently bought the remastered deluxe editions of some of Collins’ older work, which came with an extra disc’s worth of live and demo recordings. This song, from his first solo album, has been on repeat in my head since yesterday, when I finally got to hear the extra live version. Apparently, it was originally a slower, artsy Genesis song until they played it back at double speed, prompting Collins to rerecord it himself with Earth, Wind, and Fire’s horn section.

Katy Perry, “Birthday” (2013)

There’s a restaurant in Shinjuku called The Dancing Crab, where the staff periodically dances if a group comes with a special occasion. The most common of these are, of course, birthdays, and since going there the other day, I’ve had the song they use stuck in my head.