I don't think that Jack Teagarden's relevance in the history of jazz should be considered simply hype. It is true that the titles "King" of this or that were overblown titles, and partially the unfortunate result of the terrible social biases and injustices that were prevalent at the time. Rok is, sadly, correct that it is unlikely that a black jazz player at the time would have been designated "King" of anything by the majority white ($$$) audiences. Nonetheless, it is also true that Benny was responsible for exposing vast audiences to "Swing"; hence the title "King of Swing". Having said that, Teagarden is correctly credited for bringing the trombone to the modern jazz era. He was the transitional link from the traditional supporting role of the trombone in dixieland to the more prominent role as solo instrument in "Swing". The guy could really play and demonstrated a facility on the instrument that must have been considered amazing at the time.
http://m.youtube.com/watch?v=4MlFCDcP2zM
Bottom line for me: Louis Armstrong chose him to play in his band. I doubt that Louis succumbed to hype. Interesting that Teagarden and Benny should be mentioned: Teagarden was a white player in a black band, and Benny Goodman's band was one (maybe first?) racially integrated band with the addition of Lionel Hampton, Charlie Christian and others.
http://m.youtube.com/watch?v=4MlFCDcP2zM
Bottom line for me: Louis Armstrong chose him to play in his band. I doubt that Louis succumbed to hype. Interesting that Teagarden and Benny should be mentioned: Teagarden was a white player in a black band, and Benny Goodman's band was one (maybe first?) racially integrated band with the addition of Lionel Hampton, Charlie Christian and others.