Otona no Teiku Sono 5

 is a musical composition from the Nichijou soundtrack. Used in the after-credits scene in Episode 3 where Yuuko finishes reading Mai's comic, the piece is essentially a copyright-friendly version of the jazz standard Take Five, originally and most famously recorded by the Dave Brubeck Quartet in 1959: it clearly sounds like Take Five, but is different enough that they don't have to pay to use the song.