I’m a great fan of Sir Roger Scruton who has devoted a large part of his attention as a philosopher to the study of beauty, or, more technically, aesthetics. He himself is a composer with several operas to his name, as well as being an accomplished pianist/organist. Here is a link to one of his latest books on music. His interest also extends to architecture and environmental sanity.
And if you want to read something of his that is quite accessible and helpful, here is a good place to start.
See what you think of this little clip on Lady Gaga.
And, here is his BBC Documentary on Beauty
And this on desecration