The music we hear but do not always listen ... The attention paid to the dressing and the musical illustrations of the radio programs is at least as old as the radio itself. By nature, the color of these sound elements evolves with the time and the trends but also according to the public to which these programs are addressed. Thus the dressing of an information program is not that of a documentary or fictional content, as that of a national program differs from that of proximity. The economy of the means of realization and the available technological means will also influence the way of illustrating. Last but not least, the philosophy implemented by the production teams - highlighting, counterpoint, creation or order, group synergy - gives their content an identity of their own. All these aspects influence the dedicated musical creation, whether it comes from studios of independent musicians or bookstores that have systematized for decades recurring or particular needs. Aspects that will be discussed in turn during our masterclass with antenna directors from France Info, Europe 1 and RMC