The minor ii-V-I is one of the key progressions in all kinds of jazz. The two chord has a flat 5, and the V chord may have a flat nine or a sharp five. They are great fun to improvise over using a harmonic minor scale. The following practice track is in A minor, with a bossa nova feel. An example of a tune using this progression is “Black Orpheus”, otherwise known as “Menha de Carnival”. While any of the A minor scales will work over the progression, the A harmonic minor picks up the “b5” in B minor and the 3rd and the b9 in the E, so will match most closely with the progression.
||: Am |Bm7b5 E7b9 : ||