I'd like to make a radio mod for Fallout 4, but I'm not sure how to go about getting music. I know what songs I want to use, but I don't know how to find out if they're licensed under creative commons. I know some of them must be, because they're used in other radio mods, but I don't know how to find out. For example, the song "Runaround Sue" by Dion and the Belmonts: I'm pretty sure Old World Radio uses it, and I'm sure I've heard it in FNV mods. However, I can't seem to find any information about how it's actually licensed, let alone how individual recordings are. How do I find this out?
In addition, does anyone have links to any good websites for finding free-to-use music that would be lore-friendly? I've found lots of sites that provide cc music, but not ones that are easily searchable by decade, for example.