I used to always refer to recorded music either as a song, or more accurately as a recording, i.e. a holistic term encompassing the song, arrangement, production, and any indescribable mojo that may have been captured for posterity.
But lately I've been hearing a lot of music, or captured sound that can't really be described as recordings because the people who put them together did little or no actual recording.
Instead, the captured sound is a bunch of samples and loops cut and pasted together, often with little or no knowledge of the musicians and recordists or AEs who actually recorded what has been sampled or looped.
To differentiate the end product from a collage, which I think of something as visual rather than auditory, I call it an editing.
Hey, Nobby. I just re-read your post; I think "editings" is as accurate and clever as the next moniker ... I just realized that Steinberg Wave Lab has a name for their "multi-track / multi-cut" assembly function: Audio Montage.