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			   The ornamental design for a musician's performance chair, as shown and described.     
    
    
    
    
    
    
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FIG. 1 is a perspective view of the musician's performance chair embodying the design of the present invention.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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