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Well I have to admit I didn't remember what Mayakovsky wrote and didn't check it... I stand corrected.

I think раскрывая is imperfective form while раскроя is perfective. More common form of this word would be раскрыв or открыв, but this is a poem and the poets don't always choose commonly used...

I think it is much simpler. Раскроя in this case is from раскрывать (open). When you open a grand piano (lift the top deck) it sounds much louder. [/b]