“Wow” in terms of what the admissions committee or members of the music faculty would think. For example, if you’re a string player and you’d be among the top players at a global music camp like Interlochen Arts Camp at least or Aspen at most, then “wow.” Or, if you are unfamiliar with places like that, and you’re a violinist, playing a concerto like Bruch #1 or Lalo Symphonie Espagnole really well would count.