Note from Lone Wolf

It may be that Costa was associated with the Canadian music scene. A song "Anthems for a Seventeen Year-Old Girl appears on the album 2004-09-17: Austin City Limits, Austin, TX, USA. Broken Social Scene is a Canadian indie rock ..." group formed in 1999. (source: internet.)

However the similarity between song titles (one singular, one plural) may be a coincidence. Costa's singular version makes much more sense, for a single song. Alternatively, it may be the same song. Perhaps she ghost wrote for Broken Social Scene or was even a member of the band. I don't know how close to the great lakes scene the band was located. I feel they were either very close, or else vancouver-based.