I believe the law states
that it can't be distinguishable from the original.
(
riverghost servicing your mum since,
Tue 8 May 2007, 11:07,
archived)
In terms of music, it's more about whether or not the song would still be a song without the sample.
If that helps at all.
For example, "Ice Ice Baby" would not still be a song if it didn't have that sample from "Under Pressure".
(
gronkpan @vomitinglarry.bsky.social,
Tue 8 May 2007, 11:27,
archived)