*** They found that 12.8 percent of male musicians and 11.8 percent of female musicians were left-handed. The rate of left-handedness in musicians was significantly higher than in the control volunteers. In this group, 8.5 percent of males and 7.3 percent of females were left-handed. Thus, being a professional musician is associated with a modest increase in left-handedness.***
From the article.
In other words, the vast majority of musicians are right handed.