Could someone tell me where could I get Marty Robbins and Slim Whitman's mp3 downloads please?

iTunes ?

That was very helpful :(
Dear friend I did search and got only a few. The idea was that if anyone knows some url which has a good collection it could be helpful.
Anyway thanks for your prompt reply.
Warm regards

Try umm... Apple - iPod + iTunes (http://www.itunes.com)