In preparation for their 40th Anniversary Concert Celebration which raised $500,000 for the Duke Ellington School of the Arts at the Kennedy Center on Feb. 24, the legendary band held a master class at the school the preceding day. For over four decades, Earth, Wind & Fire has captivated audiences through its blend of soul, funk, gospel, blues, rock, and jazz. The concert was the latest installment in the Performance Series of Legends that has featured David Chappelle, Denyce Graves and Stevie Wonder as a revenue source for the school. Founded in l974, Duke Ellington is the only D.C. high school that provides pre-professional arts training and college preparation to more than 500 talented area students and can boast a 98% graduation rate with 95% of its seniors being accepted into colleges, universities and conservatories.