Think of Piano bar, Female Soloist and Piano style vocals Babs, that style is solo ballad and fits the description of what this gig is looking for !
Mack the Knife, Summertime, My Funny Valentine, Bossa styles such as the "Look of Love", Girl From Ipanema etc. (easy listening- bar room style)
Sounds as if they want ballad style solo vocals without any harmonies in the arrangments. Does the original version of Bothsides now have any harmony parts ? or is it all a single female vocalist in the arrangement ? How about Jazz Standard ballads such as Stormy Weather or Cry me a River ?
A lot of the "Candlelight Cocktail" piano accompaniment *easy listening* genre songs fit that bill.. Does the DJ Sammy Do rendition of "Heaven" break into harmonies or is it all solo ? I think that's along the lines of what this contest is asking for... Female SOLO songs, without harmony.
Depending on version, Fever
Here are some others. This type Standard is great for Female Soloists. Lord knows, I was the backing before Karaoke existed...
http://www.jazzbacks.com/cgi-bin/online ... ale-vocals