This is difficult, because more songs remind me of fall or winter than spring. But I'll give this a try!
Amorphis- The Castaway
Ensiferum- Lai Lai Hei (one of their happiest songs)
Nightwish- Lagoon (very relaxing)
Eluveitie- Slanias Song (actually, a lot of their songs remind me of spring)
Led Zeppelin- Over the Hills and Far Away (I don't know why)
Type O Negative- Green Man