Need advice please

I have ripped my cd collection (and those of friends and family) and selected the best songs that I saved on a usb in Wave format. I have around 1500 songs on the usb at this stage. I often listen to music stations such as LM Radio, Magic FM and Mix FM. I often hear songs that I remember from my youth and have no idea where to find them. An example of a song I am looking for is Hot summer nights from the band Night. I cannot find these cd"s in the music shops and was wondering if anyone can give me advice on where to find these old songs, preferably in Wave format. Thanks