Zimbabweanmusic includes folk and pop styles. Much of it is based on the mbira[?], a traditional instrument from the Zezuru[?]Shona[?]. It has 22-28 metal keys on a soundboard, usually placed in a large gourd resonator.
... proposals.
Examples of existing "digital rights management" and "copy protection" systems:
Serial copy management system[?] (SCMS)
Macrovision
iTunes
Windows ...