Sound wise the Oric is very similar to the Atari ST, Amstrad CPC, MSX, or later generation Sinclair Spectrum machines.
The main difference tends to be the base clock, the Oric’s YM is clocked at 1mhz while the Atari ST’s runs at 2mhz, which influences how low and how high it can get… but on this specific case the shots could have been played higher, I guess it was Chema’s choice :D
And yeah, he wanted to pay homage to all these 80ies songs, so he decided to go with all these classic tunes.
Glad you like it, and thanks for commenting, much appreciated!