It was most commonly used in the 40's-50's when rock and roll became popular.
why jazz music called devils music
Its an opinion. In my opinion there is no "devils music"
No. That death metal stuff is! :P
In music, the term "retard" means to gradually slow down the tempo or pace of the music.
Very
music, lyrics and sheet music
That's not a standard term in music.
In music, the term "am" typically refers to the chord A minor, which is a minor chord built on the note A.
depends on where it is.... what is the context?
It reders to a bar.
In a singing style
I know of no music term "gure." There is, however, the word leger, as in leger lines, the lines on music staff paper, for writing music.