Glen Campbell will appear on The Tonight Show With Jay Leno this evening. The legendary singer/songwriter will perform both “It’s Your Amazing Grace” and “A Better Place.” This marks the first time an artist has performed twice in the same episode since Leno has hosted the program. Campbell was recently diagnosed with Alzheimer’s disease and is the middle of his final tour. Please pre-order the October/November issue of Relix to read Yo La Tengo frontman Ira Kaplan’s interview with Campbell.