Hi Gauco,
Welcome to lilypond. What is your use case? Are you simply wanting to produce guitar tab, or are you wanting to do programmatic/algorithmic composition which outputs to lilypond? If the former, lilypond is fine for TAB as is, and many people use it. As for the algorithmic programming in R using lilypond as a backend, I have a feeling you will need to contact the tabr user community, if they have a mailing list or forum. Andrew
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