In bluegrass and other music, the G run (G-run), or Flatt run[1] (presumably after Lester Flatt), is a stereotypical ending used as a basis for improvisation on the guitar. It is the most popular run in bluegrass, the second being "Shave and a Haircut".[1]
The best known version, above, is a slight elaboration of the simplest form, below.
![\relative c' {
\time 4/4
\key g \major
g4 [a8~ (ais8~)] [(b8) d8~ (e8) (d8)] | g4 r4 <d g b g'>4 r4
}](https://upload.wikimedia.org/score/m/g/mgm57lxvwi1h6nwf6bvwydgff4yqfxa/mgm57lxv.png)