Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with instruments of amusement) Playing music in a dream indicates amusement, falsehood, and empty talk. It may indicate a calamity if it is at a funeral.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) Playing music may indicate hearing news. If the music is beautiful, it is good news; if it is ugly, it is bad news.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) Playing music is interpreted as worry. Whoever sees himself playing music will be afflicted with worry.