From 1820 to 1920 over 4,400,000 Irish emigrated to the US, creating an Irish diaspora in Philadelphia, Chicago (see Francis O'Neill), Boston, New York and other cities. O'Neill made the first recordings of Irish music on Edison wax cylinders. Later, Irish musicians who were successful in the USA made commercial recordings which found their way around the world and re-invigorated musical styles back in the homeland. For example, American-based fiddlers like Michael Coleman, James Morrison and Paddy Killoran did much to popularise Irish music in the 1920s and 1930s, while Ed Reavy composed over a hundred tunes that have since entered the tradition in both Ireland and the diaspora.