A cappella [a kapˈpɛlla] (Italian for "in the manner of the chapel") music is specifically group or solo singing without instrumental accompaniment, or a piece intended to be performed in this way. It contrasts with cantata, which is accompanied singing. The term "a cappella" was originally intended to differentiate between Renaissance polyphony and Baroque concertato style. In the 19th century a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the term coming to mean unaccompanied vocal music. The term is also used, albeit rarely, as a synonym for alla breve. 

A cappella music was originally used in religious music, especially church music as well as anasheed and zemirot. Gregorian chant is an example of a cappella singing, as is the majority of secular vocal music from the Renaissance. The madrigal, up until its development in the early Baroque into an instrumentally-accompanied form, is also usually in a cappella form. Jewish and Christian music were originally a cappella,[citation needed] and this practice has continued in both of these religions as well as in Islam.

1. What is Gregorian chant an example of?
2. What does that mean?
3. What does it mean in Italian?
4. Is the madrigal a cappella?
5. When did someone add instruments?
6. Was most music from the Renaissance a cappella?
7. Do religions use it?
8. How many?
9. Which ones?
10. Is there another one?
11. Is it used as a synonym?
12. What is a synonym for alla breve?
13. How often is it used that way?
14. What is accompanied singing called?
15. Did a cappella always mean unaccompanied singing?
16. Did it have something to do with Polyphony?
17. what kind?
18. Is this different from Baroque concertato
19. When did a cappella get it's current meaning?
20. Was this due to some kind of ignorance?

Provide a numbered list of answers.
1. of a cappella singing,
2. singing without instrumental accompaniment,
3. "in the manner of the chapel"
4. Usually
5. in the early Baroque
6. the majority of secular vocal music was
7. yes
8. Three
9. Jewish and Christian
10. Islam
11. unknown
12. A cappella
13. rarely
14. cantata
15. no
16. Yes
17. Renaissance
18. yes
19. In the 19th century
20. yes