His friendship and professional involvement with William Shield, from his first days at Covent Garden, set the character of his career. He and Shield, Charles Bannister, Charles Dignum, 'Jack' Johnstone, Charles Ashley and William Parke in 1793 formed themselves into 'The Glee Club', a set which met on Sunday evenings during the season at the Garrick's Head Coffee House in Bow Street, once a fortnight, for singing among themselves and dining together. Many of Shield's songs were either written for him or were sung by him, with the composer's high approval. Shield said of him that, not only did Incledon's interpretation of the songs he had written for him never disappoint his expectation, but that he often brought a grace, beauty and charm to them which the composer had not imagined to be present in his own work, and that a large share of the popularity of those songs might be credited to Incledon's unrivalled excellence in singing them. Many songs were written for him also by George Baker (1773–1847), the composer and organist of Stafford and Derby, who had been a fellow-pupil of Incledon's under Jackson at Exeter.