Forever Summer

This song is sung in the Phineas and Ferb episode "Run Away Runway" while Phineas, Ferb and Isabella were making outfits for the Summer All The Time Collection, and then on the catwalk.

Lyrics
Part 1 (While Designing)

Forever summer

Forever summer

(Summer)

(All the time)

(Summer)

(All the time) [Isabella laughs]

Forever summer

Never fall

Sometimes spring

Forever summer

(Forever summer!)

Part 2 (Catwalk)
Forever summer

(Summer)

(All the time)

(Summer)

(All the time)

Forever summer

Never fall

Sometimes spring

Forever summer