Ommadawn was the third solo album by Mike Oldfield. Appeared in the British market in October 1975, being criticized and praised alike. Only time has placed this work among the most mature of the symphony stage of the musician of Reading, and for two reasons: first is denoted the elaborate production of the album, with the neat transitions between tunes on and the first part of the work, which claimed Oldfield in the recording studio as a musical instrument of his creations, and secondly, by the consolidation of multi-instrumentalist Oldfield facet, which this work would be used under and acoustic guitar, banjo, bouzouki , bodhrán, Spanish guitar, bass and electric guitar, keyboards, glockenspiel, harp, mandolin, percussion, piano, spinet, steel guitar, synthesizers and bajosextos (twelve-string guitar), along with his own voice. The work breathes Celtic and African influences, and although it would be risky to detract from the enormous efforts made by musicians like Peter Gabriel, he can be considered a clear precedent for the so-called World Music. Curiously, one can note that the original work contains an unspecified third cut on the face, a vocal piece composed by Oldfield and William Murray called "On Horseback". This piece appeared in a single in December 1985 B-side of In Dulci Jubilo, and Mike himself who sings accompanied by a children's choir.

Ultimately Mike Oldfield was not only subject to temporary fame, and was admitted into the elite of rock at the time. This is reflected in the contributions of veteran musicians who became interested in the work of Reading.