The members of Green 4 played a variety of instruments, often switching during their set. Mary Timony sang, played guitar, keyboards and also drums on a couple of songs. Erin MacLean and Anna Johansson often played the bass at the same time and sometimes strap-on keyboards. Erin also played drums on one song. They used the drum machine extensively, sometimes even with live drums. Green 4 played a handful of live shows between 1999 and 2001 with no formal releases and were selling an untitled homemade CD with six songs in 2000.