The itself is not illegal to download. However, publishing a remix for commercial profit without licensing the composition from the rights holders (Sony Music / Boney M’s estate) could lead to copyright claims. For personal study, practice, or non-commercial YouTube covers, MIDI files are generally considered acceptable under fair use provisions.
The MIDI file will load with default sounds (usually cheap, generic computer sounds). To make it sound like Boney M: boney m gotta go home midi link
"Gotta Go Home" was released in 1979 as a double A-side with "El Lute" and became the group's final number-one hit in Germany. It was famously re-written from the 1973 German song "Hallo Bimmelbahn" The itself is not illegal to download
: A video preview of professional MIDI individual tracks for higher-quality production. or non-commercial YouTube covers