A Week in the Engine of a Bus is the third album by Granada-based pop band Los Planetas, released on April 13, 1998. According to critic Jesús Llorente, "it is not only the most important album released by a group born from indie, but also one of the best pop works in Spanish since the beginning of Spanish-language pop." An album that from the very beginning managed to arouse passions in both the specialized press and the group's fans. Rockdelux magazine chose it as the best album of 1998, the second best album of the 1990s, and the 18th best Spanish album of the 20th century. Critics from Babelia, the cultural supplement of the newspaper El País, selected it as eleventh among "The 50 Best Spanish Albums of the Last Half Century." It reached number 20 on the Spanish sales charts. As of July 2014, approximately 50,000 copies of this album have been sold. To celebrate the fifteenth anniversary, the group played the album in its entirety on May 25, 2013, at the Primavera Sound festival in Barcelona and on June 1 of the same year at the festival held in Porto. To commemorate the album's twentieth anniversary, Los Planetas performed it in its entirety, accompanied by classical musicians, as part of their 20th Anniversary Tour.