Formed and fronted by ex-Marmalade guitarist Hughie Nicholson, Blue signed to RSO Records and released their eponymous debut album the same year. Nicholson was a member of Marmalade between 1971 and 1973, writing fifteen songs to fulfil their Decca recording contract, including the hits, "Cousin Norman", "Back On the Road", and "Radancer" before he left to form Blue. He wrote the majority of Blue's material, including their most recognised number, "Gonna Capture Your Heart". Earlier in his life, he had been a member of the 1960s Scottish rock outfit, The Poets.

Blue's debut single "Little Jody" failed to chart. It was recorded before Jimmy McCulloch joined the band. A revised version of "Little Jody" appeared on a compilation album, 20 in 2002. They then added another guitarist, Robert 'Smiggy' Smith (born 30 March 1946, Kiel, Germany) before recording and issuing their second album, Life in the Navy.

This revised line-up did not last for long, following a dispute with RSO, only MacMillan and Nicholson remained. The duo then added Charlie Smith (drummer) and David Nicholson (bass), and it was this line-up that signed to Elton John's record label named The Rocket Record Company and scored a US Billboard Hot 100 chart entry, and UK Singles Chart Top 40 hit, with "Gonna Capture Your Heart". It was their debut release from the Another Night Time Flight album which was produced by Elton John and Clive Franks. Blue released two other singles from the album which both failed to enter the UK Singles Chart.

They released one other album for Rocket; Fools' Party (1979) before parting company and re-locating to Los Angeles, California. They spent three years compiling new material and playing the local clubs such as The Roxy, The Troubadour, The Palomino, Madame Wong's and the Central Club (later The Viper). Unsuccessful in securing a contract with their new material, they returned to the UK in 1983, shortly before which Blue released the single "Don't Wanna Make You Cry"/"Moonlight" on the Zuma label (1982). Nicholson released "Love You Made a Fool of Me" (1984), and whilst continuing to record with MacMillan, also wrote and produced four singles with Gary Numan on lead vocals; "Radio Heart", "London Times" and "All Across the Nation" which were released under the name Radio Heart in 1987, and "Like a Refugee (I Won't Cry)" released under the name Da Da Dang in 1994. The first two releases entered the UK chart.

In 2003, the remaining personnel Hugh and David Nicholson plus Ian MacMillan took the then high flying boy band Blue to court. It was a high profile High Court case over the use of the band's name. But the 1970s band Blue heard the judge opine that "it is not difficult to distinguish between the present day pop group, and the original users of the group's title". They subsequently came to an agreement that they could continue to share the name. Wikipedia