Do special numbers (short numbers) that are used in singing competitions and are made available to customers by order of the marketing department affect the sanctity of the entire monthly salary or only part of it, and is it sufficient to give a percentage of the salary to the poor and needy to purify the money?

Singing that includes music or lewd lyrics, or a woman singing for men, is forbidden (haram (definition)). Therefore, it is not permissible to organize singing competitions, or to spend money on them, or to assist in them, as this constitutes cooperation in sin and aggression. What is obligatory is to stop participating in issuing contact numbers for singing competitions, because the work and the salary received for it are forbidden. Istikhara (seeking guidance from Allah) does not legitimize what is forbidden, so there is no istikhara for forbidden or disliked matters, as the limits of Allah are not to be transgressed.