Charles Otis Waller (January 19, 1935 – August 18, 2004) was the lead singer and guitarist for the bluegrass band The Country Gentlemen.
In 1957 he and Busby returned to the Washington, D.C. area, where Waller met mandolinist John Duffey and banjo player Bill Emerson.
Waller was held in high regard for his singing ability especially on songs like Legend of the Rebel Soldier, Two Little Boys, House of the Rising Sun and many others.
Though Charlie usually played rhythm guitar, he flatpicked lead on some songs such as Under the Double Eagle, Spanish Two Step and Electricity among others.
A month before his death Charlie Waller told his bus driver, Kenny Wurzburger, that he had a pain in his liver.