There are some songs that I've enjoyed more over the years as I've listened to them. Not too long ago, I listened to the Genesis song "That's All" more closely and got to appreciate the song even more. I think the lyrics cover a relationship dynamic that some may be familiar with.

The Beatles: Things We Said Today - I never particularly liked this song when I was growing up, including this live version (performed by Paul McCartney & band in 1990), but this version has grown on me (particularly the guitar solo):

The Doobie Brothers: Turn It Loose. I don't think this is one of their well known songs. I had heard it when I was younger, but I've appreciated it more over time.

That's a few I can think of for now.