In defence of A.Lee452’s opinions on OSTs, Google (and the OED) describe music as “vocal or instrumental sounds (or both) combined in such a way as to produce beauty of form, harmony, and expression of emotion.”
Use of the phrases “beauty,” “harmony,” and “expression of emotion” suggest that what is or isn’t music is highly subjective, and what one group perceive as a well-made harmonious melody could be viewed by others as a mess of random notes, assembles like a house of cards in a hurricane.
As a counter to the argument I just made, however, the definition doesn’t necessarily require the opinions of the listener, as one can attempt to express emotion even if it is not obvious to onlookers.
Fun fact: “Cheese” kind of looks like “chess”, although cheese doesn’t often use ‘en passant’