I've been doing it both ways, but sometimes you go through several style just , like you mentioned, to see if the certain style bring a particular song to you, for example, like in your Audya, the style 'Blusey mood' fits Moody blues's "Night in white satin" so perfect, also not bad for "Then you can tell me goodbye" as well. To me it's almost easier when the style reminds me of a particular song than try to find the style to fit the song, but, like I said, I'm doing both.