[6] Aaron was born as Karen Lynn Greening in Belleville, Ontario,[7] and began singing in school musicals at the age of five.

However, years later Canadian Musician Magazine mistakenly embellished the incident into Aaron requiring complete facial reconstruction.

[10] After singing in a music production when she was fifteen years old, she was asked to join a local rock group, which the members including Karen would name "Lee Aaron".

The album featured well-known musicians of the Toronto music scene, including members of Moxy, Rif Raf3 (Q107 Homegrown Vol 4 / Lee Aaron Project band), Santers, and Triumph's Rik Emmett.

Aaron later concluded that posing for the magazine damaged her musical credibility;[5] she regretted the decision and assigned blame for it to pressure from her manager.

[5] During the recording of Metal Queen, guitarist John Albani (ex-Wrabit)[14] joined the band and he and Aaron formed a solid songwriting partnership that lasted eleven years.

She was cast and appeared that year in an ALCAN Performing Arts Award-winning production called 101 Songs for the Marquis De Sade.

[21] In 2017, Lee Aaron played a number of shows in Germany as well as an appearance at Bang Your Head Festivals and two separate gigs in London and Wolverhampton.