AcousticBrony

Acoustic Brony is a brony rock band from the UK. They are characteracterized by their unique style of alternative rock which takes a wide range of influences. The group started by making instrumental themes and show covers, but have since moved into creating complete original songs. They are best known for their side project with MandoPony.

AcoustiMandoBrony
AcoustiMandoBrony is a predominantly Hard Rock group consisting of Acoustic Brony and MandoPony, being signicifantly heavier than the bulk of either's solo material. The most famous song from the group is Loyalty, with I'll Fly Higher coming as a close second.

Loyalty is the first of AcoustiMandoBrony's themes for the mane6. It wasn't followed up by Kindness until a year latter. The song features a drum solo from Ed as well as a more typical guitar solo from Jimmy.

I'll Fly Higher is the first song by AcousticBrony and MandoPony, setting the president for the project. A year later a second version was released which is remastered and goes on for another minute.

Other notable songs:

Mane Six Themes
AcousticBrony's original project was creating instrumental themes for each of the mane six ponies which incorpore melodies from the show. Most of the themes were finished early on, but it took significantly longer for them to complete Pinkie's theme. By view count these remain Acoustic Brony's most popular solo material. 

Spectrum is by far Acoustic Bronies most popular solo song. The song is characterized by it's tendancy to switch between Post-Rock and Hard Rock based passages, representing different aspects of Rainbow Dash such as her laziness and her love of speed. As Rainbow Dash lacked any songs at the time this was made it is based around her passages from Winter Wrap Up and At the Gala.