243 song submissions were presented by music publishers to the festival's organisers, Società ATA, for the competition. In December 1966, an advisory commission lead by composer
Carlo Savina and composed of four journalists, narrowed down the list of submissions to thirty-five. ATA then chose thirty entries from the list to compete in the event, increased from the original aim of twenty-six, with two of the entries rejected to prevent possible plagiarism claims if they were to compete. Among the competing artists were and , who were given the right to participate after winning the 1966 edition of the
Castrocaro Music Festival for newcomer artists. Initially American musician
Johnny Rivers was announced among the competing artists, set to perform the song "", but withdrew before rehearsals.
The Hollies were announced as his replacement, before refusing to perform the song and being replaced by . The song "" written and performed by
Domenico Modugno, was also set to be performed by French singer
Christophe, but due to disagreements with Modugno over his performance, he withdrew from the competition on the day of the first semi-final. He was replaced with , as suggested by Modugno. Notable figures from abroad were featured in the list of competing artists, such as multi-award-winning American singer
Dionne Warwick, American singer and actress
Cher, and the English singer-songwriter
Marianne Faithfull, who at the time was in a romantic relationship with musician
Mick Jagger. == Contest overview ==