This list is fine, it just doesn't really say anything useful (some call these "truisms"). Many of the responses posted haven't actually responded to the
precise wording of the statement.
1) A pro never plays more notes than necessary.
EVER. This is true. A pro knows how many are necessary, and plays that (unless they're having an off day). That could be a billion notes a minute - if necessary. So, the statement is true, but silly. A more useful statement may have been "A pro
knows how many notes are necessary at all times".
2) Fair enough. I'd almost say though, that this statement is a generalisation of all of the others, so is not entirely necessary.
3) Same as #1.... yep, a pro will ALWAYS have a reason..... Your point? We
could have argued about how often changing register is necessary/unnecessary, etc, but with the qualifier "for no reason" - well - yeah. In fact, a complete n00b doesn't change for no reason - usually the reason is cause he/she thinks it's cool. They may be wrong, or their reasoning invalid, but it's still a reason.
4) See 2. Fair point though.
5) Not completely certain what this was eluding to, if it meant "fail to articulate notes" (full stop) then yep, that's a beginner error, if it meant "always plays the really important notes", I'd say a pro plays the important and unimportant notes with equal conviction and value. Well, I guess I'd say there are NO unimportant notes
6) Yes, a pro should always play with rhythmic accuracy. I'd say that was an instrumental basic. Like saying a good cook never overdoes a steak. Seems pretty obvious
So people, no need to get out your chop-defense-guns, there was no direct value judgement in this list, other than those relating to unquestionably essential elements of playing (time/technique).
Just had to respond.....
"there's no need to play a lot of grace notes that step all over what the soloist is doing" - but sometimes it's nice to play a lot of grace notes which interact with and enhance the solo. Don't leave that poor fella out on his own! (I play horn a lot, and there's nothing worse than a rhythm player who goes into backing-track mode for the solo on a ballad).
Just teasin' ya. I'm quite certain you didn't mean to exclude the above situation