Both the regular soundtrack and the remixed version of crypt of the necrodancer are great. The original being mostly electronic or a weird chip tune blend, then the metal remix by familyjules7x has to be one of my favorite remix's to date.
Crypt of the Necrodancer Steam Page: http://bit.ly/1PtOiGZ
Full OST Here: http://bit.ly/1Gp7fJk
Metal remix Here: http://bit.ly/1PtORjW (Spotify link for quality)
Any of SmoothMcgroove's Acapellas are great IMO. He covers a wide range of games from sonic to mario to final fantasy, all that stuff. A remix album by gamechops was also just released and is great as well.
Youtube Channel: https://www.youtube.com/user/SmoothMcGroove
Remix Album: http://bit.ly/1mfDjYv
Hope you like these! Happy birthday!