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1.
"THIS IT IS TO BE A MAN OF THE HIGHEST TYPE. TO BE AND NOT SEEM; TO DO AND NOT SIMPLY TO TALK;
TO HAVE THE RIGHT IDEAL, THE TRUE MOTIVE AND PATIENTLY TO TRANSFORM CONDUCT IN ACCORDANCE WITH IT
SO LET IT BE FOR SINFONIA."
- Ossian Everett Mills, March 15, 1912

A Sinfonian is a member of Phi Mu Alpha Sinfonia. This is a fraternity of musicianly men who strive for the advancement of music in America.
Are you a Sinfonian?
by Crabs February 13, 2005
 
2.
A member of Phi Mu Alpha Sinfonia Fraternity of America, a national men's music fraternity.
That fellow is wearing a Phi Mu Alpha shirt. He must be a Sinfonian.
by Sinfonian September 02, 2011