"Dynamic Motion" (1916) for solo piano, written when Cowell was nineteen, has been described as "probably the first piece anywhere using secundal chords independently for musical extension and variation." Though that is not quite accurate, it does appear to be the first piece to employ chromatic clusters in such a manner. A solo piano piece Cowell wrote the following year, "The Tides of Manaunaun" (1917), would prove to be his most popular work and the composition most responsible for establishing the tone cluster as a significant element in Western classical music. (Cowell's early piano works are often erroneously dated; in the two cases above, as 1914 and 1912, respectively.) Assumed by some to involve an essentially random—or, more kindly, aleatoric—pianistic approach, Cowell would explain that precision is required in the writing and performance of tone clusters no less than with any other musical feature: