Music is a sound experience with strong narrative power. Music is a question of taste, tone, infinitive colour and emotions. The tone quality is all about the magic, always.
To realise a soundtrack it’s not possible to use music which you haven’t purchased the rights to nor use classical music considered public domain. One can consult music libraries as well as numerous catalogues found online fully aware of its poor quality. The best option is to contact a musician with his own recording studio and who is able to compose an original track suitable for the context. This way, one can be sure to have all the rights and possess an original piece.