The question was whence 'bluegrass'? Since I saw no mention of Bill Monroe and His Blue Grass Ramblers (I think) I'll just say that.
Can't say I'd heard of the Blue Grass Ramblers, but to state the final thought in Richie's presentation, the style of music played by Bill Monroe and his Blue Grass Boys became known as bluegrass music.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
By clicking on the Date (Posted), you will dig out every message posted that day.
sj