“There, There” by Radiohead. I’ve got last-song-on-the-radio-itis.
On My Mind by Powderfinger.
“Forever Autumn” by Justin Hayward.
Borknagar’s Rivalry of Phantoms. I just listened to it.
I usually have this ‘default’ background music in my head:
The Super Mario Brothers music.
I am cursed.
“The Immigrant Song” by Led Zeppelin. I just watched the Viking Kittens again.
“We Used To Be Friends” by The Dandy Warhols.
(clap-clap)
The Ballad of Sweeney Todd
“The Acid Queen” by the Who. Particularly the bridge section for some reason…
“Why Must I be a Teenager in Love.” Someone please shoot me.
“Dear Catastrophe Waitress” by Belle and Sebastian.
“Good Morning America”. Just saw Arlo Guthrie last night. 
“When Sunny Gets Blue” by the Pooh Sticks.
How the heck did this thread get revived 3 months later?
Probably someone found it in a search, didn’t realize it was old, many apologies, etc. That’s always the way.
Since it’s been revived I’ll add my own: “State of the Nation” by New Order.
Killing Me Softly - Roberta Flack
“Kissing a Fool”-- George Michael
“M62 Song” by Doves
after seeing the thread title, “Voicesin my head” Denis Leary
.
“Kiss at the End of the Rainbow”, Mitch and Mickey.
Seriously, I had a dream where I was singing the song. And I’m singin’ it!