Song Data: Closest or Exact Match?

I'm a startup founder debating whether to use EchoNest or iTunes. To prompt a song preview in our app, will the EchoNest API return the closest match (as YouTube does) or only an exact match (as iTunes does) from our search query?

With complicated search queries that include remixes and different versions of songs in parentheses and/or brackets, iTunes often doesn't return the remixes, but does return the simplified, basic song. Is this also what EchoNest will do?

Thanks so much.