To give full artistic life to mus. left by the composer in a contemp. style, e.g. to fill out the continuo bass line of a 17th‐ or 18th‐cent. comp., to write in ornamentation, to interpret vague directions as to the manner of perf. Thus one speaks of Britten's ‘realizations’ of Purcell, etc., rather than his ‘arrangements’, and of Leppard's ‘realizations’ of Venetian operas compared with ‘editions’ by Harnoncourt, Glover, etc.