Her evident virtuosity quickly led to performances of challenging and otherwise neglected romantic and contemporary music repertoire, such as
Liszt's
Piano Concerto No 2 with the
BBC Symphony Orchestra conducted by
Constant Lambert on 5 May 1945, and (on 30 May 1945 with
Frederick Thurston and others) the first broadcast performance of
Hindemith's Quartet for clarinet, violin, cello and piano. Other contemporary works she championed were
Alan Bush's
Le Quatorze Juillet (on 17 February 1948), James Iliff's Piano Sonata (which is dedicated to her),
John Lambert's Piano Sonata (played at
Morley College on 14 March 1954) and
John Greenwood's Piano Quintet. She also contributed to the revival in interest of the music of
Charles-Valentin Alkan, broadcasting four recitals of his music in 1948. On 28 August 1945, aged just 23, Greenbaum made the first of 13 appearances as a soloist at the
BBC Proms with a performance of Constant Lambert's
The Rio Grande. It became her calling card, with Lambert saying that he preferred her interpretation to that of
Hamilton Harty who premiered the piece in 1929. (She played it at the Proms for the final time on 15 August 1951 with the composer conducting, just days before his death). She followed this on 7 September 1945 with the first performance in England of
Schoenberg's Piano Concerto,
Basil Cameron conducting. Despite some underlying hostility the work was received by the audience with unexpected enthusiasm, and (according to
The Musical Times) she played with "immense courage". She also performed Schoenberg's
Phantasy, Op. 47. Other Proms appearances included
William Walton's
Sinfonia Concertante (14 January 1947),
John Ireland's
Legend for piano and orchestra (10 September 1948),
Alan Rawsthorne's Piano Concerto No 1 (7 September 1949), and the first UK hearing of
Sergei Prokofiev's
Piano Concerto No. 2 (26 August 1955), by then 40 years old. In 1952 Greenbaum was one of three pianists (the others being the identical twin piano duo
Mary and Geraldine Peppin) performing
Peter Racine Fricker's
Concertante for three pianos, strings and percussion. ==Composition==