References in early writings to African music in pre-European times often indicate the existence of harmony. On entering Mossell Bay in December, 1497, Vasco da Gama's men heard four or five flutes played by negroes, “some producing high notes and others low ones, thus making a pretty harmony” (Davidson, 1964). At Malindi, in 1498, Vasco da Gama's Logbook referred to “two trumpets of ivory … of the size of a man,” whose music “made sweet harmony” with those of anafils. Writing on the music of Ashanti and other peoples of the Gold Coast (now Ghana), Bowdich mentioned “several instances of thirds” (Bowdich, 1819).