Nailson dos Santos and Prof. dr. Anand Subramanian from the Universidade Federal da Paraı́ba, Brazil, and myself developed a system for computer assisted guitar solo generation. Example output is shown below, together with more "random" solos that were used in an evaluation experiment.

The dataset that was put together for this research, consisting of a number of 1-bar licks, is available here.

The system was recently presented by Nailson at the XLVIII Simpósio Brasileiro de Pesquisa Operacional (SBPO), in Vitória, Brazil and published here:

Cunha N., Subramanian A., Herremans D. 2017. Generating guitar solos by integer programming. Journal of the Operational Research Society. - Preprint version

Acknowledgement
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 658914.