[LAU] [slightly OT] Musical citation (what is allowed?)

[Julien Claassen]

Hello everyone!
   I'd like to cite from a relatively recent work (1970), which of course is 
still copyrighted. So can I do it per se? I'd just like to cite a main phrase 
for a bit (2-4 bars) I suspect. any hints on that would be very much 
appreciated.
   Warm regards
            Julien

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