The orchestra rehearses on Tuesday, but the chorus rehearses on Wednesday.

There is a comma before the word "but".Sometimes it is not used. this is a very confusing.

Can you please clear it,when should I use comma and when no comma.

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Comments  (Page 4) 
You use a comma in compounds sentences. There should be a subject and predicate (verb) on each side of the conjuction to be compound.
EX. I go to the store, and I buy apples. Compound
I go to the store and buy apples. Simple
Commas before "and" should, according to the Chicago Manual of Style, take place if you are connecting two independent sentences (independent + comma + conjunction + independent) and before the last item of a list, but the latter is often contested (the AP Style manual, for example, will ask writers not to place a comma before the "and" in a list).

I will agree with the no comma rule before "because". "Because" subordinates without contradicting and will, as such, even turn independents into dependents. Some people like to place commas before "because" to clarify that whatever follows "because" is the, say, sole reason why what precedes "because" is true or false, for example.

Yes, most style guides will insist on a comma before "but" always being correct.
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AnonymousCommas have nothing to do with a writer's voice and everything to do with grammar and punctuation and correct English; the rules don't change just because the writer wants them to. That's like saying you can spell it any way you want because you are the author. It's simply not true.
Fiction writers most certainly play with the structure of a sentence, and even spelling, when seeking to create a particular feel. I say this both as a published author who's done it and as an avid reader who's seen it many times. Who, for example, dictates how I'm supposed to write out the slurred speech of a drunk? I may sound it out one way (and therefore write it out one way) while another author sounds it out differently all together, even punctuating it differently for effect.

And when trying to emphasize that a character is frantic and breathless, rambling quickly and obnoxiously, it's not uncommon for a writer to use a run-on sentence to hammer the point home. The way that a reader hears what they're reading is definitely just as important as, if not, at times, more important than, being technically proper.

So, I agree with using a comma being grammatically correct if what follows "but" is an independent cause, but I don't agree that this means it's always the right choice. There's such a thing as creative license. If you don't want the comma there because the style of voice that you're writing in or the way that the character is speaking would be better served by the lack of a pause, you can leave it out and be fine. It can take away from the flow and feel of your piece otherwise.
Ok, then, Mr. Editor. Explain e.e. cummings.
Some people deliberately go against conventions.
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LOL- But isn't it the writer who puts the comma in the writing in the first place that tells the reader when to pause? I have recently been reading 'Mary Poppins' and find it rather annoying to read because of the wording and grammar. I may just be tired, cause I am usually reading it at night to my daughter, but I find that I have trouble reading it out loud, and I feel that I am extremely good at reading to audiences, I do it quite often. I also enjoy Hawthorne, and find that his writing runs on and on. I once argued with my teacher about writing style and when I pointed out that other authors (I believe I used Shakespeare) wrote in such a way, she said, 'You aren't Shakespeare.' Who can argue with that? :/ I noticed, also, that an author I was reading the other day capitalized words, again, I think it was P.L. Travers, that didn't warrant capitalizing. I found this a breathe of fresh air. I think that if the author decided to spell a word incorrectly, as long as they do some throughout the text, then they SHOULD be allowed. I think that it is saying something about their writing style, especially if it is a character doing it.