One of the features that makes a minor key sound so rich is its V7(b9) chord illustrated below as a V-I in the key of A minor. 
The exercise shown below will greatly increase your familiarity and confidence in improvising over this lovely chord. Play through the chart while listening to the audio file offered below. (As indicated on the chart, Bb instruments start at measure 1, concert instruments begin at measure 9, and Eb instruments start at measure 45, taking the d.c. and playing up to the fine as indicated.)
CRAIG BUHLER JAZZ 
Reblogged this on I Write The Music.
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