A HD copy of the opening song from "The Last Day of Summer", the Phineas & Ferb finale.
You can also download an instrumental of this song here: https://mega.co.nz/#!wZ5EzayL!3G4QKge8Z6tCD3LFhX0FS5SwCQua0uZ82MlpIgpNyXM
The instrumental was taken from a surround sound copy of the episode, but it's not perfect. Still, it's better then nothing. Feel free to upload a better instrumental if you have one.