William Perkins

William holds a bachelor's degree in Music Performance from MSU Denver. During his time at MSU he majored in both classical and jazz guitar performance. William began playing guitar at the age of 9 and has since mastered a wide variety of musical styles including jazz, classical, baroque, mariachi, and classic rock.  He can frequently be found performing at local venues, festivals, theater productions, busking, and touring with rock bands.  His command of diverse musical styles gives him the ability to multi-task musical roles and instruments while he plays. With a hi-hat at his left foot, he uniquely imitates the sound of a whole jazz rhythm section. Come watch him cleverly improvise arrangements of your favorite songs!

Karl Allen

Originally graduating with his degree in vocal performance from CU Boulder, Karl's musical journey eventually led him to founding the Teller Duo in 2023. With a voice that has been described as 'rich, expressive, and chocalatey' along with his bold and inventive violin playing Karl's leading performance is sure to delight and impress as he and William revitalize old favorites with their unique sound.