For 2 trumpets & 2 trumpets ad lib (i.e. 2 or 4 trumpets), 2 violins, 3 violas (or 3 trombones), & basso continuo. Trumpet parts are published in C as Clarino I & II, plus Tromba I & II ad libitum. Viola/trombone parts are for Alto Viola, Tenor Viola, and Bass Viola, in alto, alto (or tenor) & bass clefs respectively. Score & parts.