Equestria Dude (Youtube)
Hergest Ridge (Youtube)
Former Members (not currently in the band)
The Beatle Bronies' adaptions of Beatles tunes into Pony tunes (by changing the lyrics of the songs into MLP focused tracks) may have made them a one-trick pony, but they have found quite a few fans, a big spotlight in the fandom, and a Bandcamp page with album titles and covers that mirror their respective originals. Perhaps their greatest achievement is honoring both the pony and Beatles communities and being one of the only pony bands (multiple members of the band all united by the internet) running. All You Need is Ponies!
Notable track: Sweet Apple Acres Forever