I think if you play these oldies now with your arranger or todays instruments , it's mostly called mainstream. at least in europe it is.. Oldies is pre worldwar II
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76