Two of his main influences are Romanian folk music and Byzantine chant, both of which he used in his teaching.
Returning to Bucharest, he taught from 1937 to 1941 at the Academy for Religious Music, and then from 1941 until his death was a professor of composition at the Conservatory.
Constantinescu used folk and liturgical elements in his works, with a strong command of form and modal harmony.
He did much to pave the way for the post-Enescu generation of Romanian nationalist composers.
Played by the Romanian State Philharmonic Orchestra/conductor: Ion Baciu (Both recordings are re-issues of LPs on the Electrecord label)