My standard for "good writing about music" probably derives partly from examples like Richard Taruskin's occasional forays such as this one in which he does a fine job of exposing some of the excessive claims of the Early Music movement. I like writing about music to be something you can get your teeth into instead of the froth that usually passes for writing in the mass media.
But I did just run across another writer on music that has been doing a good job for quite a while: Jan Swafford, a composer and writer who has a regular column in Slate Magazine. His most recent outing was on beautiful melodies and he points us to quite a few interesting examples from Monteverdi to Brahms to the Beatles. Another fascinating column was about how he learned to love Mozart's The Magic Flute and how he learned to dislike Philip Glass.
In another column he explains why Leonard Cohen is a great lyricist and songwriter and is quite probably better than Bob Dylan. Here is a touching piece on the last music composers wrote before they died. Here is a wide-ranging survey of what composers are up to these days, A Grand Tour of Contemporary Music. Oh, note that the clip attributed to "Eight Songs," by Jefferson Friedman is actually something else. You can find the correct clip, if you really want to, on YouTube. Finally, here is a brilliant little essay on the power of silence.
Jan Swafford always has something interesting to say and he manages to say it without becoming too technical. Just one problem with the older pieces: the musical examples seem to be the wrong ones or they are missing entirely. You will have to search them out on YouTube.
Let's end with an artist that Taruskin cites as being "premodern", i.e. before the trend towards the literal, the impersonal and the lightweight, Wilhelm Furtwangler conducting the Berlin Philharmonic in 1952 in a performance of Schubert's "Unfinished" Symphony: