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"It's a Beautiful Day" is a song written by Mike Love and Al Jardine for the American rock band The Beach Boys. The song was never released on an original Beach Boys album; however, it was released on the soundtrack to the film Americathon and as a single in September 1979 with B-side, "Sumahama". The song has also been released on the Ten Years of Harmony Beach Boys compilation album as well as the Made in California compilation.