The pent or scale you would play depends on the key your tune was written in. Sounds like you need to brush up on your music theory in the lessons forum. Playing one scale or pent over an entire tune only kinda works if all the chords are in that key. Often a tune will have chords that are not in the key or chords that are changed from majors to minors or the reverse. That means you still have to know your chords to be able to figure out when to change the scale your playing and what to. I don't do scales so one of the other guys will have to chime in with specifics.
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