Dooley was a good ol' man he lived below the mill...The song is a traditional bluegrass tune, but it is also considered to be a string band classic. It will keep your feet tapping and is popular among bluegrass pickers all over the world. It's best to get down the Scruggs style and backup first before tackling the melodic version, but if that's what you are interested in, go for it!
The Scruggs version features a great roll that sounds awesome and is a really good workout for your thumb. The Backup arrangement has some standard Scruggs fare and features some great walks that help lead the ear from one chord change to another. The Melodic arrangement is pretty flashy and includes a bit of single string style mixed in as well. If you like that melodic sound and are up for a challenge, then this one is for you!