When Zelda Is Rescued Fanfare
Once you defeat Gannon, retrieve the Triforce of Power, and clear a path to Zelda, you will hear the When Zelda Is Rescued Fanfare. The Famicom Disk System version only uses the RP2A03, but plays the song at a slightly slower pace.
The title comes from the Famicom 20th Anniversary - Original Sound Tracks, Vol.1 album. The song is track 12 in the NSF file.