wonder if this could be expanded to support modded songs, so we could choose from those too, definitely will keep an eye out!

While I haven't tested it myself, songs from other mods should still load and play in their destined playlist along with the "Space Age" songs from this mod. That is, this mod is designed to dynamically load all songs that have been loaded by all mods in the data/prototype stage. The only exception is for the mod settings. The game's settings stage life cycle happens before the data/prototype stage making it difficult to ascertain the song names from other mods so they can also be included as a setting in the mod settings.