1. The way people look at each other when the band plays a song for which they share a really mutual love
    Between best friends or lovers or strangers
  2. People who dance or sing along to the music
    And who don't really care what they look like. Like, you go girl.
  3. People who cry at songs that make them feel something
    (((maybe something that I do)))
  4. When the crowd gets really hushed because something is really intense or beautiful
    Bonus points for goosebumps
  5. When you can tell that someone is discovering a band for the first time
    And they are so excited that they run to the merch table to meet the band
  6. When the band really seems to be enjoying themselves and it doesn't feel like just another stop on their tour
    Witty banter is a bonus.