Definition of purvey. purveyed. ; purveying. transitive verb. 1 : to supply (as provisions) usually as a matter of business. 2 : peddle 2.
Using a capo is easy. You just have to think of it as a movable nut. Clamp it on the fret you will use for the key you are playing in, and just play chords or picking from a key you know. You can play in G using chords from the key of F if you put the capo on the second fret.
A capo (short for capotasto) is used to change the pitch of open strings. Capos are clipped onto the fretboard with the aid of spring tension, or in some models, elastic tension. To raise the guitar's pitch by one semitone, the player would clip the capo onto the fretboard just below the first fret.