following the successful public demonstrations of broadcasting by the awa and others, the awa commenced in 1921 a regular series of concerts that were widely heard all over australia and laid a framework for the introduction of broadcasting in australia. the handful of wireless experimenters licensed to transmit at the time also commenced regular and intermittent transmissions of speech and music. a number of amateurs commenced broadcasting music in 1920 and 1921. these included 2cm, sydney; 2yg, sydney; 2xy, newcastle; 3me, melbourne; 3dp, melbourne; 4cm, brisbane; 4ae, brisbane; 4ch, brisbane; 5ac, adelaide; 5ad, adelaide (not associated with 5ad which commenced in 1930); 5bg, adelaide; 7aa, hobart; 7ab, hobart. many other amateurs soon followed.