Music and Time Annotation << Back Let's Play Clean! (A Word about Intonation) M.A. Gotsdiner Pitch intonation is one of the most challenging issues in string instrument playing. This paper examines some of the complex issues involved. It describes the tunings in which string instruments are played, the so-called Pythagorean coma, and touches on specific tuning issues for keyboard instruments, as well as the specifics of intonation in string and keyboard ensembles. Keywords: Oistrakh, Kogan, Pythagoras, fifth scale, tempered scale, natural scale. DOI: 10.25791/music.12.2025.1389 Pp. 26-31.