I'm borrowing this phrase from a friend of mine who uses the word 'cheerful' a lot - not a word I had heard or used a great deal before I met her, but one which I now think should be used more! I don't mean you have to be relentlessly happy all the time, but constant complaining and muttering about things is really off-putting and disrespectful to the people around you. If you have a problem with something musical and someone can help, ask about it! If you have an issue with something else to do with the group, find an appropriate time to raise it with whoever can do something about it.
If you don't like the music, well, that's something you have to put up with sometimes - if you like the majority of what a group plays, then try to see the odd 'horrible' piece as a learning experience. If you don't like the majority of what a group plays, then you'd need to have another very good reason for carrying on playing with them (maybe you're getting paid huge amounts of money and that's more important to you at this point of time). Grumbling about it isn't going to change how much you like it.
Despite the photo above, a comedy grumble about a tricky key signature is usually acceptable. It is fine to explain if something is difficult on your instrument - a group of flautists I play with has a non-flautist as a conductor, and he's very open to learning about the peculiarities of the flute and why we are struggling with something in particular! Explanation is nearly always much more useful than complaint or excuses (more on this below).
You should apologise if you're (occasionally, unavoidably) late for rehearsal. You should apologise if you accidentally knock over your colleague's music stand or hit them on the head with a piccolo (if you're doing these things deliberately, you probably shouldn't be there). You really don't need to apologise if you play a wrong note or make another musical mistake - for one thing, everyone does it. For another, there's a chance that nobody noticed anyway, and by apologising, you're just drawing attention to it. If they did notice, they already know about it - if they think it needs to be pointed out, they'll point it out ("remember that's a B flat in that bar"). If they think it was just one of those slips that happens to everyone sometimes, they won't mention it, so you don't need to mention it either. Everyone has bad days, and everyone knows that everyone else has bad days, so if you're having a bad day, just do your best, try to remain as cheerful as possible and don't make a huge show of what a bad day you're having.
Often apologies sound like justifications - "I know what I'm doing, really, I just didn't do it that time". Instead of telling people you know what you're doing, it's far more convincing to show that you know what you're doing, by doing your best to concentrate, practise and improve. It's fine (and indeed a good idea) to acknowledge things you need to work on - say you're in a quintet and you're trying to figure out part of a piece, and you know that it'll fit together better once you've mastered those semiquavers, then it's good to say "I know my timing is a bit off there, and I need to practise those semiquavers before next time" - it shows awareness, both of what you're doing and how it affects the whole (then do go and practise that bit for next time).
Don't make excuses
The same goes for making excuses - "I haven't had time to practice this week" (that will either be obvious, or it won't, either way, you don't really need to tell everyone). As discussed in the last post, explanations are OK, if they are helpful - if you tell the conductor "my flute has suddenly broken and I can't play any Fs" that is possibly useful, as they then know there's a technical issue and there's no point in replaying that bar with all the Fs in it this evening, because no number of repetitions is going to make it sound right.
This isn't to say you shouldn't offload to your friends if there's something bothering you about a group - or you had a bad tone day or you just can't stand a piece of music that you're having to play - that can be very therapeutic and a good idea, indeed a better idea than muttering behind your stand when you should be listening to the conductor. Playing music isn't going to be completely fun all the time, and it's unlikely that a group is going to completely suit you 100% of the time. If you're unhappy a lot in a particular group, then maybe it isn't right for you. If you can cheerfully accept that there will be bits that are challenging, find that fulfilling and get on with what you're there to do, things will be much happier all round.
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