Eastman Parlour acoustic guitar, model number E20. Some of the oldest steel string guitar designs that serve as the foundation for the current acoustic guitar family tree served as inspiration for the E20P Parlor's long and narrow body shape. Originally made popular in the late 19th century, this small guitar has frequently been passed over in favour of its larger and louder siblings. However, players who value the parlour body style's remarkable tonal balance and responsiveness, as well as its portability and cosy feel, are starting to use it again.