ever since the commencement of the wireless regulations 1922, amateur services (then termed "experimental") had the right to broadcast music and speech. the commencement of high power class a and class b broadcasters in the mid-1920s saw a change in focus for listeners, but even in metropolitan areas there were only three or four high power services and amateur broadcasting provided greater, if mostly less professional, variety of programming. in the hiatus of broadcasting development of the late 1920s, amateur broadcasting in regional areas was often the sole source of programming. such broadcasting was increasingly curtailed on medium wave from the 1930s and by 1939 was largely confined to shortwave, it continued to provide a variety of programming choice, especially in regional areas. with the commencement of ww2, all amateur transmission rights were withdrawn. upon cessation of hostilities in 1946, amateur licensing was reinstated, but not the right to broadcast music and entertainment.