About Jeffrey Hammond
Jeffrey Hammond, also known by his former stage name Jeffrey Hammond-Hammond, is an English artist and musician who was the bassist of progressive rock band Jethro Tull from 1971 to 1975. Hammond played on some of the band's most successful albums, including Aqualung (1971) and Thick as a Brick (1972). Hammond adopted the name "Hammond-Hammond" as a joke, since both his father's surname and mother's maiden name were the same. Hammond met Ian Anderson in grammar school and formed a band with him and future Jethro Tull members John Evan and Barriemore Barlow. Hammond is also mentioned in the lyrics of the Benefit track "Inside".
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.