Avril Lavigne wrote the song Complicated.
Her breakthrough single , `` Complicated '' , peaked at number 1 in many countries around the world , as did the album Let Go.
`` Complicated '' is the debut single by Canadian singer-songwriter Avril Lavigne , released in 2002 from her debut album , Let Go.
It was written by Lavigne and The Matrix -LRB- Scott Spock , Lauren Christy , and Graham Edwards -RRB- , and produced by The Matrix.
