In my band, many of the songs we play change keys, and use borrowed chords. In an effort to "play it safe" when creating basslines for these songs, can I always be assured that I am playing the right notes if I play chord tones? Is this a fail-safe method, with no exceptions? Evenually I should know when the song changes key, and the appropriate scales to use over chords, but in the interm, I don't want to drag the band down playing bum notes. Another reason is, I know all of the tones that form every chord variation, and, of course, I know how to locate these notes on the fingerboard.