Frank and Steve are primarily writers, secondarily musicians. Since 1970, they have been writing together. To them, the most important thing about a song is the song itself, not the performance. They are not the fastest riff players or the fanciest, they don't have professional chops or virtuoso capabilities. However, if you listen to their music, you will see that they can communicate their mood, emotion, and vision of the song quite clearly. The songs, and the occassional lyrics, speak for themselves.