I have an audition coming up, and ran into some symbols I've never seen before on the charts: 1. Bb "triangle" 7 what does the triangle symbolize? 2. G +9 flat 5 This is a G 9th chord with a flatted fifth, right? Why the plus sign? 3. F9 (Ab) what is the root note here? Should I just play an F, G (9th) over this? 4. A9 this almost looks like a power chord. Does it have a major or minor quality to it? 5. Dma7 This is a major seventh chord, right?