The Rolling Stones were firing on all cylinders in 1968, at their creative peak. And among the many unique moments on Beggars Banquet was "Factory Girl". While the Stones have dabbled in country music throughout their career, "Factory Girl" is singular for them in its old time folk simplicity, drawing from both Appalachian and Irish folk traditions.
The lineup for this recording was Mick Jagger on vocals, Keith Richards on acoustic guitar, Charlie Watts on tabla, Brian Jones on Mellotron, Rocky Dijon on conga drums, Ric Grech on fiddle/violin, with additional help from Dave Mason and Nicky Hopkins.
Here's an even more stripped down version, live from 1989: