Work for str. by Tippett, comp. 1953 for Edinburgh Fest. on tercentenary of Corelli's birth. Str. div. into concertino (2 solo vn. and vc.), conc. grosso (half remaining body), conc. terzo (other half). Theme taken from Corelli's Conc. Grosso Op.6 No.2, and work quotes Bach's Fugue on themes of Corelli.