Conversation so far:
What types of melodies did Francis Poulenc create?
Francis Poulenc created melodies that were simple, pleasing, easily remembered, and most often emotionally expressive.
Who influenced Francis Poulenc?
Francis Poulenc was inspired and influenced by Debussy, Schubert, and Stravinsky.
What was Francis Poulenc's style of music like?
Poulenc was an important composer of the neo-classical movement. His music, eclectic yet strongly personal in style, is essentially diatonic and melodious, embroidered with 20th Century dissonances.

Question: What do you mean by diatonic?
Self-contained rewrite: What does diatonic music mean?