Producers often look for clean drum hits to use in new compositions. A "bass drum only" track allows a creator to take the organic, vintage sound of Roger Taylor’s kit and layer it into modern electronic or hip-hop tracks.
The phrase is a specific technical search term used by musicians and producers to find an "isolated" or "stem" track of the bass drum from Queen's 1978 hit "Bicycle Race."
While seemingly a niche request, it highlights the intersection of classic rock production, the genius of John Deacon and Roger Taylor, and the modern era of digital music analysis. The Role of the Bass Drum in "Bicycle Race"