There are several bands/artists named RPM or R.P.M.. The most well known of which are probably the turntablist and trip hop band that appeared on Mo'Wax Records' "Headz" compilations ("Headz (disc 1)"; "Headz (disc 2)"; "Headz 2A (disc 1)") in the 1990s. Their music has not been widely published other than these rare (and now discontinued) instrumentals on Headz. The tracks on the albums are "The Inside", "2000", and "Flow" which could be described as soporific, dubby trip hop.
RPM is also the product of the young people's music ministry of the Abundant Life Church, Bradford in the United Kingdom. And there is also RPM, a brazilian rock band from the 80's.