This volumeʼs contributions grew from 20 of the 94 scheduled keynotes, lectures and lecture-recitals of the first and second editions of The 21st Guitar Conference. Five items stem from the inaugural edition (2019, 44 contributions) and 15 from the second edition (2021, 50 contributions). This conference is unique in that it is centered on contemporary guitar research, performance and pedagogy. Previously, guitar research had gained increased visibility thanks to the International Guitar Research Centre, launched in 2014 (Stephen Goss, President), which regularly (co-)organizes conferences on guitar research; and Soundboard Scholar, launched in 2015 (Jonathan Leathwood, Editor) ‒ currently the only peer-reviewed journal (to our knowledge) dedicated to guitar research. We hope this volume brings awareness of the work being carried out and promotes further research.