"Best Days of Your Life" is the title of a song written and performed by American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 country

Country music

Country music is a popular American musical style that began in the rural Southern United States in the 1920s. It takes its roots from Western cowboy and folk music...

 artist Kellie Pickler

Kellie Pickler

Kellie Dawn Pickler is an American country music artist and television personality. She gained fame as a contestant on the fifth season of the Fox reality show American Idol, eventually finishing in sixth place. In 2006, she signed to 19 Recordings and BNA Records as a recording artist, releasing...

, and co-written by Taylor Swift

Taylor Swift

Taylor Alison Swift is an American country pop singer-songwriter, musician and actress.In 2006, she released her debut single "Tim McGraw", then her self-titled debut album, which was subsequently certified multi-platinum by the Recording Industry Association of America...

. It was released on December 1, 2008 as the second single from her self-titled second album

Kellie Pickler (album)

-Promotion:To help promoting the album, Kellie Pickler was released in a regular edition and a Deluxe Edition, including the normal CD, along with a special DVD with 30-minute footage from Pickler on her tour and behind the scenes of the recording process , and the music video for "Don't You Know...

. Swift also provides background vocals on the song.

Pickler debuted the song with a performance on November 12, 2008 on the 2008 CMA Awards. Since then she has also performed the song on American Idol, The Ellen DeGeneres Show, and the 2009 CMT Music Awards

CMT Music Awards

The CMT Music Awards is a fan-voted awards show for country music videos and television performances. The awards ceremony is held every year in Nashville, Tennessee, and broadcast live on CMT. Voting takes place on CMT's website, CMT.com.-History:...

.
"Best Days of Your Life" is an up-tempo country pop

Country pop

Country pop, with roots in both the countrypolitan sound and in soft rock, is a subgenre of country music that first emerged in the 1970s. Although the term first referred to country music songs and artists that crossed over to Top 40 radio, country pop acts are now more likely to cross over to...

 song mostly backed by electric guitar

Electric guitar

An electric guitar is a guitar that uses the principle of direct electromagnetic induction to convert vibrations of its metal strings into electric audio signals. The signal generated by an electric guitar is too weak to drive a loudspeaker, so it is amplified before sending it to a loudspeaker...

.