The original design of the Saxophone mouthpiece, year of 1846, Vs today's design.
Jazz is one of the few arts that can be considered truly American. Founded primarily in the south during the 1800's, this form of music was the first significant African American contribution that would be heard all around the world. Its constantly changing nature and loose rules allow it to be flexible and therefore, viable to audiences of all ages.
In a musical context, general dictionaries define a groove as "a pronounced, enjoyable rhythm" or the act of "creat[ing], danc[ing] to, or enjoy[ing] rhythmic music."Steve Van Telejuice explains the "groove" as the point in this sense when he defines it as a point in a song or performance when "even the people who can't dance wanna feel like dancing..." due to the effect of the music.
from wiki : )