A very popular album goes gold, platinum, or even double platinum, without containing any hit songs on the singles chart. Songs may appear on genre-specific radio charts, but otherwise the album sells itself. In The Fifties and The Sixties, albums were often perceived as secondary to hit singles. This began to change when groups like The Beatles and The Beach Boys started to produce albums which tried to avoid Album Filler and make every song count. The British Invasion helped, thanks to the then-common practice of excluding hit singles from albums. See also No-Hit Wonder.