In April 1739, age 54, he had a stroke. It was probably this which left his right arm paralysed for a while so that he could not perform, but he made an excellent recovery after six weeks at a health spa in Aix-la-Chapelle. At this time he started to write oratorios instead of operas. In 1742 his oratorio "Messiah" was first performed in Dublin. Surprisingly, it was not successful in London until 1750 when it was performed in aid of the Foundling Hospital Chapel. Handel performed it every year there, which brought the hospital about £600 for each performance. Handel spent most of his time in these later years composing and producing oratorios. "Judas Maccabaeus" was particularly popular. The singers for these oratorios were English and Italian. They were not world-famous virtuosos but singers whom Handel had trained himself.