Here is the newest demo from MISTER BEEP, JAD and TRIXS.
It is for pure ZX Spectrum 48K.
DO NOT USE EMULATORS, they can't emulate BEEPER's sound properly.
And remember - sound chip of ZX48 is also its CPU, so - like we used to say among Spectrumers - "when music is playing, scroller must stop". Ha-ha.