While everyone agrees that all forms of music that contain pagan, sensual themes, or subliminal messages are clearly forbidden, the latter group of scholars considers all forms of music free of such themes and messages as permissible.
As a matter of fact, we know from the authentic traditions that the Prophet, peace and blessings be upon him, not only allowed music in the weddings but also listened to girls singing: While listening to girls singing on such an occasion, he interrupted them only once when they sang the following verse, “In our midst is a prophet who knows what will happen tomorrow”; whence, the Prophet, peace be upon him, told them, “Cut this sentence out, and continue singing what you have been singing earlier.” There is nothing in the sources to indicate that the above permission is limited to the occasion of wedding, as some people tend to think.
In light of these, according to the last mentioned group of scholars, music that is deemed to be free of un-Islamic and unethical themes and messages, the same is true of musical instruments so long as they are not used for the above, have been considered as permissible.