As record costs went down over time and greater thought was given to the album as an artistic piece, double albums became more common. One of the first examples consisting of new studio recordings is 1956's "Ella Fitzgerald Sings the Cole Porter Song Book". However, Bob Dylan's" Blonde on Blonde", released on June 20, 1966, is widely considered to be one of the first double albums in popular music with complete original recordings by the artist. This album was followed just a week later by another double album and the debut by The Mothers of Invention's, "Freak Out!", which was released on June 27, 1966.