In order to perform music like Vangelis' Memories of green, I would like to generate or find a track with typical cliché electronics and retro-futuristic computer sounds from the first computers era, similar also to those in Welcome to the machine, by Pink Floyd, and other space-themed productions.
Is there any site where I could find, for example, some open sources to use in Reason or similar software, or just some audio files to use as background? Else, what could be a good starting point and recommendations to build my own track with these tools?