Songs that you love every second of. The ones that have no - 'I'm not keen on that part.' - bits. I can't not crave listening to these songs every day. I've just noticed a few lovelies:

Trail of Dead - Intelligence
Smashing Pumpkins - Hummer
The Go! Team - Huddle Formation
Pixies - Monkey Gone To Heaven
The Smiths - This Charming Man
The Postal Service - Such Great Heights
Trail of Dead - Another Morning Stoner

Its not just songs I like, but songs you can't skip. Songs that make you dislike someone when they call it shit.