iRealPro is by far the closest to BB; thanks for suggesting Ray - and for your feedback Matt, Scott, and Keebo. I just plunked my $11.00 for it very happily - the library of songs (chord progressions only) you can download is huge (not that it's rocket science to enter a bunch of chord names in - but it is REALLY nice not to have to do it and go right to using the product for it's intended use)

The only thing missing from it is the melody lines - which are great if you're looking to discover new tunes while walking your dog lol (which is actually how I use it ha ha).

Regards,
Joe