After several lineup changes prior to their recording career, they settled on Harris, vocalist Paul Di'Anno, guitarist Dave Murray and drummer Doug Sampson.
The bands original line-up in December 1975, included Harris with singer Paul Mario Day, guitarists Terry Rance and Dave Sulivan and drummer Ron Matthews.
[2] Harris temporarily disbanded Iron Maiden in December 1976 so he could replace Rance and Sulivan with guitarists Dave Murray and Bob Sawyer, while retaining Wilcock and Matthews.
[3] By mid-1977, Matthews, Murray and Sawyer were all fired after conflicts with either Wilcock or Harris,[4] and replaced by guitarist Terry Wapram and keyboardist Tony Moore and drummer Thunderstick (real name Barry Purkis).
[4] This line-up only lasted one show before Moore was fired by Harris, as he felt that keyboards didn't fit in to Iron Maiden's music at the time.
[20] Vocalist Bruce Dickinson left his previous band, Samson, which had also included Burr, to audition for Iron Maiden in September 1981 and joined shortly afterwards.
[27] At that point, the band were in talks with Dickinson,[27] who, after a meeting with Steve Harris and Rod Smallwood (the group's manager) in Brighton,[28] agreed to rejoin along with Adrian Smith, who was telephoned a few hours later.