what is this form of music you mentioned above ?
It is group or solo performance without instrumental accompaniment.
A cappella
A cappella (, , ; ) (sometimes spelled "a capella" from Latin) music is group or solo performance without instrumental accompaniment, or a piece intended to be performed in this way. The term "a cappella" was originally intended to differentiate between Renaissance polyphony and Baro
who said the greatest thing is to love and be loved in return Eden Ahbez. who is he ? He was an American songwriter and recording artist. where was he born ? Brooklyn, New York. how did he die ? From injuries sustained in a car accident. name some songs he released ? He composed the song "Nature Boy". are there any other versions of this song ? Yes, acappella versions.
wiki:1561544
A cappella [SEP] Introduction
A cappella (, , ; ) (sometimes spelled "a capella" from Latin) music is group or solo performance without instrumental accompaniment, or a piece intended to be performed in this way. 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".