What a fantastic time to be a synthesizer nerd! When I was a teenager, I dreamt of the Yamaha DX7 and later on bought a cheap, third hand, Roland JX3P as my first synth. Today, I can find both of these re-issues on Ebay for 1/10 of what the DX7 would cost back then, and both are PORTABLE, fun and easy EDITABLE.
The song is the signature from the Swedish 80's children TV-show "Zwampen" (the Mushtroom).