Some of the tunes found here would later be used for Super Sprint instead. There was a small amount of missing/corrupt data in Atari's backup used by one of the background columns, which has been restored.
We're lucky to have anything. Atari had no official back-up policy, they were done on request.

Had this been released in 1985 it would have been one of the first, if not the first music based video arcade game. It plays a lot closer to 'Simon' than say Konami's DDR, but I think represents a missed opportunity for Atari, even if it would have needed expanding upon to be a real success.

This has been further improved
www.youtube.com/watch?v=nfGD...

I actually sent one of these to TeamEurope recently, who attempted to dump what looked like the ROM glob, but it does't seem to contain anything that looks valid.

Might be the code is internal to the CPU, and can't be dumped.

and here is Radica's Opus with the new code
www.youtube.com/watch?v=r8xG...

MAME avoided it for a while due to the MPEG stuff, but beyond that, lack of interest from anybody capable of implementing it.

www.youtube.com/watch?v=FDuE... some further progress in a video this time

(it might sound illogical, but MAME tends to be best tested after a release as more eyes are on it, so without a monthly release little regressions, like the SEEPROM issue which broke a bunch of stuff, can creep in unnoticed, so longer cycles tend to result in buggier builds)