This poster is cool because at first glance, I first thought they were piano keys, but really they were socks laid individually on a heater. The type is in red and the event name is in large letters, which immediately attracts your attention to it.
The creative use of line for guitar strings and trees is fun and could engage the audience. It could inform them about the location or the mood of the festival. Back and Forth Music Festival by Marcel Bachran, via Behance