La la la features an interesting distribution of compositions: ten tracks were born from Spinetta's pen, seven from Páez, and one, titled Hay otra canción, was a joint creation. Additionally, the album incorporates two outside pieces: the tango Gricel, by Mores and Contursi, and an instrumental by guest musician Carlos Franzetti. Among Spinetta's most notable compositions are Todos estos años de gente, Cuando el arte ataque, and Asilo en tu corazón. For his part, Páez contributed gems like Folis Verghet, Instant-táneas, and Parte del aire. Originally released as a double vinyl album, the initial CD version omitted the track shared by both, Hay otra canción. A later reissue in 2007 recovered the entirety of the material on two CDs.
The collaboration between Spinetta and Páez in 1986 represented a particular milestone in Argentine rock, uniting the foundational generation with the one that emerged after the Falklands War and democratic recovery. Spinetta, at 36 years old, had been exploring a sound closer to techno since Mondo di cromo (1983), while Páez, at 23, had already demonstrated his talent accompanying figures like Juan Carlos Baglietto and Charly García, and with his album Giros from the previous year, he was positioning himself as one of the great figures of national rock. This project was conceived after a failed attempt by Spinetta to collaborate with García and at a time when Páez sought to materialize his desire to play with his musical idols. Years later, at the concert Spinetta y las Bandas Eternas in 2009, Spinetta and Páez revived part of this repertoire, performing together songs like Retrato de bambis, Asilo en tu corazón, and Las cosas tienen movimiento, accompanied on some of these by Juan Carlos "Mono" Fontana.
