Thank you Robert for your comment. Yes, a pair of CBGs, 3 string (151) and a 4 string (5135) makes a great duet set. Once you understand both, you can easily pick up a six string (515135)and combine your discoveries. Enjoy.
Welcome aboard, Robert! You will find lots of helpful folks and information here on all things CBG (CBB, CBU, etc.) Feel free to poke around, ask questions, and post your stuff (photos, recordings, videos, etc.).
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Most of all, have fun!
Tres.