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@DavidSchwartz: Plagiarism is a special form of copyright infringement; copyright grants authors the right to be credited for their work. The term is also frequently (mis)used in acedemia, where it means something else, but in this context, plagiarism is most certainly a legal issue.
I didn't downvote, because I agree this is a useful explanation, perhaps more so than F7/D (though it's hard to say without more context), but it is somewhat of a non-answer. "What is the name of this chord?" - "Not important."
The mention of an organ is relevant, because I think a keyboard without weighted keys does not qualify as 'just a bad piano', it's something else: something in between a piano and an organ. It can still be used to make music and if you enjoy playing it, you should. That goes without saying. However, if your intention is to learn the piano, non-weighted keys are not ideal. I upvoted this answer for highlighting that.
@BrianChandler: Our eyes have receptors for three different frequencies of light. Our ears have receptors for far more than five or seven different frequencies of sound. I don't think these questions are alike at all.
@tim: I think this may vary strongly with the kind of music you're into. The figure in my collection is 72%, but 95%, while clearly an estimate, does sound plausible.
My argument is that you're tackling the problem from the wrong end. I'd argue not relying on other band members is a flaw rather than a skill. If communication is difficult, for instance due to a lack of monitors, the 'fix' (other than installing monitors) is to communicate better, not to communicate less.
"I think that's their weakness, they depend too much on each other for timing and cues." I disagree with this analysis. Independance in timing and cues is indicative of an inexperienced band. Expect every gig to be suboptimal. Many problems can be mitigated in some way, but listening to the rest of the band will always be crucial.
I like this answer, but it oversimplifies with the suggestion that the chords of a song are not subject to copyright. That's often true, but not true in general. International copyright law does not simply put lyrics and melodies in one column, chords and rhythms in the other.
