Angel's Song/Maybe Just For Sure was originally written by Debbie Harry from Blondie and was cover by me.
I've used Deflemask with C64 tones. The tones themselves weren't too difficult to edit, actually. Some arpeggiators were used to compensate the lack of channels (A lot of C64 music used arpeggiator in games too).
Just to let you know, I'm now open for chiptune music commissions. If you have a request, please PM me, check my commission advertisement. Thanks