"Baby's in Black" is a song by The Beatles, co-written by John Lennon and Paul McCartney and released in the United Kingdom on Beatles for Sale and in the United States on Beatles '65
AMG described the song as "a love lament for a grieving girl that was perhaps more morose than any previous Beatles' song." The lyrics are about Astrid Kirchherr, a friend and photographer The Beatles met during their first trip to Hamburg. She was Stuart Sutcliffe's fiancée, and was distraught over his death.
Lennon and McCartney sang their vocal parts simultaneously through the same microphone. This was done at their own insistence in order to achieve a closer feel to the performance. McCartney was subsequently contacted by their music publisher in 1964 enquiring as to which melody line was the main tune (i.e. Paul's higher or John's lower melody). McCartney later said that he told the publisher they were both the main melody.