So"lo (?), n.; pl. E. Solos (#), It. Soli (#). [It., from L. solus alone. See Sole, a.] (Mus.)
A tune, air, strain, or a whole piece, played by a single person on an instrument, or sung by a single voice.
© Webster 1913
So"lo, a. (Music)
Performing, or performed, alone; uncombined, except with subordinate parts, voices, or instruments; not concerted.
© Webster 1913