Gnu - T For Texas was also called Blue Yodel #1. I agree it's a great song.
A few years back I played in a bluegrass group, McCormick, and we did Blue Yodel #2, My Lovin' Gal Lucille. At various gigs we had 3 different mouth harp players sit in with us for this song, Mike Glover, Dave Mowatt and Mike Stevens. Although harmonica isn't really a bluegrass instrument, it sounds great for that song, as did Zeke Mazurek's fiddle.

I still like to do some of Jimmie Rogers' songs, but, since yodelling is beyond my vocal abilities, I play a yodel lick on the guitar.