"29 settembre" ("29th of September") is a song composed in 1966 by Italian musician Lucio Battisti and lyricist Mogol and brought to success by Equipe 84 in March 1967.

[6] The lyrics, written by Mogol, tell the story of an adultery which lasts only one day and is made with lightness of mind, without consequences on the protagonist's other sentimental relationship.

In the Italian society of the 1960s the subject was considered almost a taboo;[7] in pop music, songs based on rosy and idealized loves prevailed, while adultery was almost always portrayed as a serious misconduct.

[9] The narrative is so blurred and surreal that the listener is kept with the doubt on whether the extramarital adventure really happened, or whether it was just a dream made before waking up.

[5] However, it was noted that the date of September 29 coincides with the birthday of his wife of the time, Serenella;[10] this aspect could suggest an autobiographical nature of the text, almost a public confession of an infidelity made by the author.

[5] He said he regrets not having dedicated the song to her from the beginning, while his wife (who knew Mogol's proverbial inattention) understood that the tribute was not intentional and in fact did not thank him.

[14] So Battisti renounced to sing it personally and consented to hand it over, despite Mariano Detto insisted that it was the right song to launch his career as a singer.

[14] For the solo single, Battisti had to fall back on the two lesser known tracks Luisa Rossi and Era, which enjoyed little success.

[16] The song was published as a single in the last days of March 1967, in monophonic version, as the A-side of a 7″ vinyl disc which had È dall'amore che nasce l'uomo in the B-side.

[19] In 1967 Equipe 84 recorded an English version of the song titled 29th September, with lyrics translated by Tommy Scott.

[21] Equipe 84 played the song using lip sync inside the 1967 musicarello movie I ragazzi di Bandiera Gialla.

The video, directed by Mariano Laurenti, is in color and is set in a bar on the shore of Laghetto dell'Eur in Rome.

First of all, he removed the voiceover radio news announcer, a strongly innovative element in the Equipe's version, which was considered no longer necessary (since the story told was now widely known to the public and there was no need to make its understanding easier).

[5] The choice of musical instruments is also more traditional: the arrangement consists of a tangle of guitars, bass and flutes, while there is no drum at all.

[9] Strings and brasses, at first discrete, later acquire a more important role,[5] and finally result in an instrumental coda which closes the track.

According to Stefanel, the coda throws an ambiguous light on the mood of the protagonist, leaving open if the return with his partner is really happy or actually forced.