This chord is made up of the 1, 3, 5 and b7 positions of the Bb Major Scale: Bb C, D, Eb, F, G, and A. This gives us the notes: Bb, D, F and Ab. The “b7” symbol means that we take the seventh position of the Bb Major Scale and we flatten it by 1/2 step giving us our “Ab”.
There are 5 different versions of this chord below for you to try playing. These are challenging, so please do not get discouraged if you aren’t able to play them right away, especially the barre chords. You need to build up strength in your hands before you are able to play barre chords. Check out this post on how to play barre chords for beginners. It has a ton of excellent resources including videos and links to other tutorials that should prove to be quite helpful.
Onto the chord charts….
Here is a key that will help you read the charts:
Everything on the above chart should be self explanatory, except for the last three in the third column. They may need a bit of explaining. The O, or open symbol, simply means that you do not press down on any notes on that string. The X means you do not strum that particular string. The Barre symbol means you need to barre that particular fret. When you barre a fret you are pressing down on multiple strings at the same time with one finger.