Now, please bear in mind that I don't know very much about theory before you all jump on me for asking a question that, for one reason or another, probably sounds ridiculous. In one of our songs, there's a chord that the guitarist made up, which consists of the notes F A C#. Would I be right in thinking that this chord is F+, or F augmented? The guitarist has also decided he'd like me to try a bass solo in the song. The other chords in the solo sequence are A, A7, and F#m7 with a fourth instead of a fifth. (Does anybody know what this would be called.) The F chord above is the last in the sequence. I've tried to work out a blanket scale for this, and I've come up with A mixolydian. Can anyone tell me if I could get away with this, and suggest any other scales that could work? Like I say, I'm not very knowledgable about theory, so I'm sorry if this makes me sound like a simpleton. Thanks in advance for any replies.