Watch the Aeolian online guitar lesson by Chris Buono from Modes That Matter
As we now know every mode has a defining tritone. Aeolian of course is no different with its tritone residing between 2 and b6. In this case that tritone is more of a bridge to another defining aspect of all scales and modes--half step instances. All the major modes have two half steps contained within them and where they are in the formula is equally important to the sound. A great way to get an Aeolian-based minor sound across is to play off the tritone between 2 and b6, but also the half step from 5-b6. This really takes off when you play that half step instance within a minor arpeggio lick--total Aeolian.