A ranking of notable bands from the 1970s has been published, with some outlets listing 25 great american bands and others focusing on more specific genres, such as prog rock, or different numbers of bands, including 15, 17, and 33. The rankings appear to vary in scope and criteria, with some highlighting obscure or forgotten bands and others emphasizing the greatest bands or albums of the decade. The exact nature and results of the ranking are unclear due to the varying reports.