Part of the BBC Proms.Grief and loss haunt an emotionally charged programme from Sir Andrew Davis and the BBC Symphony Orchestra pairing two 20th-century masterpieces, each premiered after their composers’ deaths. Berg’s Violin Concerto weaves quotations from Bach into music contrasting expressive Romanticism with cooler serial techniques. American-Canadian violinist Leila Josefowicz is the soloist. Heard here in Deryck Cooke’s performing version, Mahler’s Symphony No. 10 is another deeply personal work, charged with anguished love for an unfaithful wife, and written on the brink of the composer’s own final illness.