A Dictionary of Music and Musicians/Colla Parte
COLLA PARTE or COLLA VOCE, 'with the part,' denoting that the tempo of the accompaniment is to be accommodated to that of the solo instrument or voice.
From volume 1 of the work.
COLLA PARTE or COLLA VOCE, 'with the part,' denoting that the tempo of the accompaniment is to be accommodated to that of the solo instrument or voice.