"Bach no Senritsu o Yoru ni Kiita Sei Desu" (Japanese: 『バッハの旋律を夜に聴いたせいです。』, Hepburn: Bahha no Senritsu o Yoru ni Kiita Sei Desu.^?, "It's Because of Listening to Bach Melodies at Night") (Japanese pronunciation: [bah:anosenɺitsɯojoɺuniki:taseidesɯ̥]) is a song by Japanese band Sakanaction. It was released as a single in July 2011, one month before the band's fifth album Documentaly.

A pop and electro song inspired by the band's vocalist Ichiro Yamaguchi experience of listening to the music of German composer Johann Sebastian Bach while falling asleep, "Bach no Senritsu o Yoru ni Kiita Sei Desu" was praised by Japanese music critics for its progression, "literary" lyrics, the integration of choral vocals and four on the floor rhythm. The song's music video, featuring Yamaguchi dancing simultaneously with mannequins connected to him by metal bars was well received by critics, winning the 2012 Space Shower Music Video Awards award for the Best Video of the Year. The song was a commercial success, being certified gold by the Recording Industry Association of Japan for 100,000 paid downloads.

After the release of the band's fourth album Kikuuiki in March 2010, Sakanaction released the single "Identity" in July, followed by their first concert at the Nippon Budokan in October. Such a concert, which is often seen as an important milestone for bands, felt more like a ritual to the band's vocalist and songwriter Ichiro Yamaguchi, who was inspired to write their following single "Rookie" after the concert. During the writing process, Yamaguchi considered what direction the band should take next, what Sakanaction's place in the music scene was, and how the band was seen by others.

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