Just curious about something. You know for musical festivals where they have a number of bands, how do the promoters or the decision makers determine the order of the band lineup. For example, I noticed that on the Download festival some bands who are not quite as big as other bands are further up the totem pole and bigger, more veteran bands are lower. Now please note, I am not referring to bands like Ratt or Poison or bands like that who don't have the draw they used to.

For example this year Megadeth went on before Deftones................that is just one example

help appreciated