terminology help

["Mikell D. Nelson" <mnelson@dmans.com>]

Jim Coker wrote:
> Anyone familiar with African M'bira music?  A friend of mine
> just introduced it to me. Very nice ostinato-based. The notes
> are in patterns of 3, but the accompanying shaker beat is
> in 2.

  Can someone provide clear definitions of ostinato and legato,
especially as they would apply to guitar. Being a 'street' musician I
don't know the meaning of many musical terms. Thanks for the primer.

Motley