Ellington continued listening to, watching, and imitating ragtime pianists, not only in Washington, D.C., but in Philadelphia and Atlantic City, where he vacationed with his mother during the summer. He would sometimes hear strange music played by those who could not afford much sheet music, so for variations, they played the sheets upside down. Henry Lee Grant, a Dunbar High School music teacher, gave him private lessons in harmony. With the additional guidance of Washington pianist and band leader Oliver "Doc" Perry, Ellington learned to read sheet music, project a professional style, and improve his technique. Ellington was also inspired by his first encounters with stride pianists James P. Johnson and Luckey Roberts. Later in New York he took advice from Will Marion Cook, Fats Waller and Sidney Bechet. He started to play gigs in cafés and clubs in and around Washington, D.C. His attachment to music was so strong that in 1916 he turned down an art scholarship to the Pratt Institute in Brooklyn. Three months before graduating, he dropped out of Armstrong Manual Training School, where he was studying commercial art.