Carter Family picking, also known as the thumb brush, the Carter lick, the church lick, or the Carter scratch,[2] is a style of fingerstyle guitar named after Maybelle Carter of the Carter Family. It is a distinctive style of rhythm guitar in which the melody is played on the bass strings, usually low E, A, and D while rhythm strumming continues above, on the treble strings, G, B, and high E. This often occurs during the break.[3] The style bears similarity to the frailing style of banjo playing and is the rhythm Bill Monroe adapted for bluegrass music two decades later.[2]
With this technique, Carter, who "was among the first" to use it,[4] "helped to turn the guitar into a lead instrument".[5] It is unclear how Maybelle developed her style.
The Carter scratch can be heard on the Carter Family's first recordings, from their first session in Bristol, Tennessee on August 1, 1927. Maybelle also learned a blues fingerpicking technique from Lesley Riddle, an African-American guitarist who met A. P. Carter in December 1928 and who used to frequent the Carter family household.[6][7][8] Carter can be heard playing in this style on a number of Carter Family recordings. She also played slide guitar and, later, with a flat-pick.
I'll play a little bit of a tune here [in] the style that I learned from a colored man that used to come to our house and play guitar, and he played with his finger and his thumb.... His name was [L]esley Riddles.
[W]hen Seeger was recording Lesley, he could see and hear the similarities between Lesley's picking style and that of Maybelle Carter so he asked him if he ever gave her lessons. Lesley replied, 'No, I didn't have to. She would just watch and learn. She was that good.'
Leslie Riddle, an African American guitar player, ... taught Maybelle Carter how to play melody and pick rhythm on the guitar at the same time—a style for which she became famous.