Glen Campbell delivered some sad news last year when he revealed that he will be forced to retire because he was diagnosed with Alzheimer's disease. Currently, the 'Rhinestone Cowboy' singer is in the middle of his farewell tour.  Many fans are wondering if he still puts on a good show, well according to the reviews of his concert at the Ryman Auditorium, he's still a top-notch performer.'s Calvin Gilbert caught the show in Nashville and says: "As far as the actual vocal performance, though, he has no problem hitting all the right notes -- even the high ones on his cover version of Conway Twitty's "It's Only Make Believe." Although his voice isn't quite as supple as it was during his hitmaking prime of the '60s and '70s, that's attributable to age rather than any specific medical condition. At age 75, he still has a vocal range and power that few younger singers will ever achieve -- with or without their ProTools and autotuning programs."

The Country Music Hall of Famer relies on a teleprompter to help him through the lyrics, and with a great sense of humor, laughs off any mistakes.  Honestly, I've seen many younger stars forget the lyrics of their hits, so I'm sure people would cut him some slack if he messes up occasionally.

Gilbert continued to explain: "while it appears Campbell has to work a little harder on the lyrics these days, his skills as a guitarist remain undiminished.  He was -- and is -- an incredible player."

Glen Campbell's final Nashville show was attended by David Nail, Tanya Tucker, Larry Gatlin, Jeannie Seely and several other people from the music industry.  In February, Glen Campbell will recieve the Grammy Lifetime Achievement Award.