Chorale has more than one meaning; one is a large choir, but a chorale as a piece of music would mean a large choir piece, or another meaning was made famous by Johann Sebasti
…an Bach, the Bach Chorales (written for his choir in Germany), which are often used as excellent examples of "polyphony" and "voice-leading" meaning well-written 'songs' that have multiple voices and merge and flow well together. The Cantata is a classical form used by several composers including Bach and many others and generally features a core instrumental group (in modern parlance the so-called "rhythm section" of keyboard, bass and drums) and a larger ensemble like an orchestra, and usually a small vocal group and/or a large choir. In the cantata (which is Italian for song-piece) the small group and larger ensemble have creative interplay and the end result was/is often exciting and dramatic (the texts typically feature grand religious themes). J.S. Bach (1685-1750) unsurprisingly was known as the leading exponent of both the chorale and the cantata. He also wrote a lot of (Christian/Catholic) Masses, like Mozart did. (MORE) 
