Nick: I would urge caution. Be 100% sure you are authorised to use a piece of music. If it’s free, attribute as instructed. Be especially concerned about commercial music as companies have staff in place to monitor any illegal use or alternatively sub-contract to a specialist. There’s usually the composer(s), publishing company, record company, and management - all with a vested interest - and it’s their livelihood. They don’t take kindly to illegal use. The fines aren’t small. Usually, for example with YouTube, videos are quickly removed when unauthorised music is automatically detected so matters don’t escalate.
The standard fine for a single unauthorised use of a still image - to give you an idea - is a four-figure sum. (Think cost of a new
P4P.) Ask yourself “Is it really worth it?” if you’re thinking of a fudge or trying to get away with it. And there’s no defence if legal action is taken. Ignorance is certainly no defence whatsoever. Copyright law is well established.
Copying music for personal listening purposes onto a CD or MP3 player is generally acceptable in the eyes of the law. But this loophole or exception shouldn’t be confused with selecting music for a drone video. Do everything properly, within the law.