A music festival is a music journey, sometimes presented with a theme such as musical genre, nationality, or locality of musicians, or holiday. Summer’s almost here, and that means that festival season is already ongoing. Coachella, Bonnaroo and Lollapalooza have been the standard bearers for the festival journey, bringing in the biggest names from all genres. Many festivals are annual, or repeat at some other interval. Some, including many rock festivals, are held only once. Some festivals are organized as for-profit concerts and others are benefits for a specific cause.