bands and singer and rapers ect.. that over or sample songs should have to put the original song on the single as well and should not be allowed to on an album. and also should give 75% of the money made to the original artist!!
The Irish singer/songwriter,Gilbert O'Sullivan who would never use anyone elses lyrics took an artist to court and won his case for the reason you specified above.
If someone has written a song or composed a tune,the least the person could do if they are a well known artist aswell is ask permission to use it.
Copyright laws are specified on mostly all legitimate artists products.
I think most people who do an actual cover version of the song pay royalties to the songwriter anyway, don't they? Those who nick sneaky little samples are often another matter, of course.
The original artist/songwriter etc dont lose out they get paid very well for anything that is used and if something is released without being cleared first (the last big hip hip album to do this was the Beastie Boys - Pauls Boutique) always end up in court and always lose and have to pay money to whoever is credited with writing/performing the sample etc that they have used so theres nothing to worry about! I have a friend who works for EMI (copyright division) and that is all she does all day is listen to to radio/Tv etc to see if any of their artists have been used for anything without being cleared or licensed- Fantastic job i think!