As of the Destiny Update 1.1.2, Bungie added a Jukebox in Destiny located in the Tower and it has an audio Easter egg, a Siege of Madrigal Remix!
Just head to the hangar side and down these stairs to the bar. When you activate it, it plays a random 20 second song. There appears to be 9 different songs, including Hope For The Future by Paul McCartney, a rock remix of Destiny’s Cabal theme soundtrack, a banjo remix of the Destiny theme, and a Siege of Madrigal Remix!
Bungie used Siege of Madrigal in the game Myth and it has since appeared as Easter Eggs in ever Halo game made by Bungie – Halo CE, Halo CE Anniversary, Halo 2, Halo 3, Halo 3: ODST, and Halo Reach. These Easter eggs also appeared in their respective locations in the Master Chief Collection with achievements!
And now you can add Destiny to the list – I’m just surprised it took them this long to decide to add it into their game, since it’s been in every Bungie game since Myth.