My loving a song could be for any number of reasons, although to be honest lyrics tend to be the last thing I pay attention to. In fact, I don't know many of the lyrics for most of my all-time favorite songs!!! I think this puzzled a former Indian coworker who I made a mix-cd for; he wanted to know what the songs were 'about', and I couldn't answer him on many of them! The songs I like also tend to have lyrics that are more...random and open to great interpretation anyway!! My lack of focus on lyrics is probably another reason why I enjoy listening to a lot of music from around the world - I have no idea what is being sung, but I DO pay attention to and love everything else.
I guess I pay attention most to the melody, the overall 'vibe'/emotion shining through the song, the rhythm, the artistic quality of the instrumentation...but I suppose emotion is what I pick up first. Raw emotion. And the music itself -- melody, instrumentation, vocals, and finally lyrics....just comes together and wraps around said emotion. But I have to sense a cohesiveness and depthness to all of it -- not just loudness covering up the absence of anything else.
I love many types of music - my list of songs I 'Love' goes over 100 or more, easily. :-)