![1970 MATTEL Optigan Program Disc: Big Top Marching Band (4/4) [70163] @keyboardresource](https://i.ytimg.com/vi/wrqq8LKqYRY/sddefault.jpg)
Uploaded May 2012 | Updated September 2026, 1 week ago
Sounds from Optigan Music Maker. Get the Optigan app to hear better samples and it works just like the real thing. You can even play the virtual discs upside-down (backwards). Or, get them at optigan.com.
Sounds from Optigan Music Maker. Get the Optigan app to hear better samples and it works just like the real thing. You can even play the virtual discs upside-down (backwards). Or, get them at optigan.com.
![1970 MATTEL Optigan Program Disc: Big Top Marching Band (4/4) [70163]](https://i.ytimg.com/vi/wrqq8LKqYRY/mqdefault.jpg "1970 MATTEL Optigan Program Disc: Big Top Marching Band (4/4) [70163]
Sounds from Optigan Music Maker. Get the Optigan app to hear better samples and it works just like the real thing. You can even play the virtual discs upside-down (backwards). Or, get them at optigan.com.")
