This painting of St Cecilia and an angel by Orazio Gentileschi (1563 - 1639) and Giovanni Lanfranco (1582 - 1647) really appeals to me. The young woman is concentrating so carefully on playing her organ. The angel is holding the manuscript but Cecilia is not looking at it. Her expression is sad and she seems to be hearing an inner voice to which she is responding.
St Cecilia is often portrayed accompanied by an angel. The reason for that lies in the mythical stories about her.
She is supposed to have been one of the Christians martyred under the Romans, possibly in Sicily or Rome in the 2nd or 3rd Centuries A.D.
The pious legends about her date from the 5th and 6th centuries. You can read one account here.
Since she is known as the patron saint of musicians I think one way to celebrate her day is to listen to part of Handel's Ode to St Cecilia and look at some more visual images as artists have imagined her. Enjoy.
Image Credit: Wikimedia Commons