It's the problem of text capitalizing... AB = Ab, the symbol for flat. On Tue, Mar 21, 2017 at 8:53 AM, David Fairweather <dmf273 at xxxxx> wrote: > what > > the heck do they mean by "AB"? > Robert Hale Serious Honkage in Arizona youtube.com/DUKEofWAIL DUKEofWAIL.com