Cramer was Clementi’s star pupil in London before, still teenage, studying with Abel (though he remained Clementi’s disciple.) At 20, he performed with the 12-year-old Hummel. He enjoyed a lasting warm friendship with Beethoven, who thought him the best pianist of his day, greatly respected his studies for piano, and went with him to listen to Mozart’s ‘Don Giovanni.’ Haydn was also a friend, while Czerny, Moscheles, Mendelssohn, Liszt and Berlioz were met towards the end of his life. Onslow studied piano with him. Cramer and Moscheles organised a banquet for Clementi, and with Field were present at Clementi’s funeral.