The Binding of Isaac Soundtrack album comprises of 40 tracks (Including those added in Wrath of the Lamb). It was composed by Danny Baranowsky and can be purchased from Danny's Bandcamp page or via Steam. It is worth noting that Bandcamp lets you name your own price (with a minimum price of $0.99 US dollars. The Bandcamp version is also available in multiple audio formats (MP3, FLAC, AAC, Ogg Vorbis or Apple Lossless) whereas the Steam version is only available in MP3 format. If you own the soundtrack via Steam, and if newer tracks are added later on, they will automatically download via update into the Binding of Isaac steamapps folder.