Hey all, I've been struggling the last couple of years to be able to hear intervals, and despite myself I seem to be making some progress. I recently saw some jazz cats in a pickup situation completely rock the house... with no charts. A new-to-the-jam singer called an obscure vocal tune, the guitarist knew it, and a quick discussion of 'oh yeah, that's in D minor...' ensued. The pianist picked up on the changes after the first chorus, with the bass following soon after. I didn't see any obvious hand-staring going on, and the tune was reasonably complicated ('All Sides Now', which I found out later was a rare and beautiful Pat Martino ballad) and 'non-standard sounding'. I asked the bassist and pianist afterwards how they did it, and they were just like "Oh, do some ear training on chord-quality. It's easy once you've got that down". They might as well have said "Oh, just build a rocket-ship out of wood and head to the moon, man. It's easy like that!" So, my question for the collective is - I'm familiar with drilling intervals to get 'interval-quality' (maj 2nd, min 6th, etc), any tips on how to train for identifying 'chord quality' like that?