AFAIK this was done by bitcointalk user thekozitwo (or something like that, too lazy to look it up). One time I complimented him/her on his beautiful singing voice and they replied that it was a hired singer doing the singing.
Last I heard from thekozitwo was when he/she sent 80K USD to Mt. Gox as it was going belly up and Bitcoins were trading for 0.1BTC/goxbux...
He/She used to hang around the Monero forums - so I think he did well in the end. Great couple of songs - now historical artefacts.
Check this out: https://www.youtube.com/watch?v=aXW-oTcrutA