Music Copyright and Performers
I have linked to Dominic McGonigal's web log about copyright terms.
When it comes, for example, to a video with music there are normally three copyrights.
There is an original copyright in the music (the dots) which exists whoever plays the music.
Then there is a copyright in the musical recording which exists for the performers.
Then there is a visual copyright in the video itself.
These different copyrights have different terms. That in music lasts beyond the death of the writer of the music. The performance one, however, only lasts for 50 years after the performance.
Dominic works for the Performers Protection organisation (PPL) who handle the music performance copyright and video performance copyright in the UK. They and people such as Cliff Richard are campaigning for a copyright extension.