HARRISON — World-class musicians will perform at 7:30 p.m. Tuesday, Aug. 4, in the fourth concert presented by the Sebago-Long Lake Music Festival at Deertrees Theater.

This next-to-last concert celebrates the 200th birthday of Felix Mendelssohn, starting with a string quartet composed when Mendelssohn was just 20 and ending with a great piano trio from his last years.

Mendelssohn was already a well-known pianist and composer as a teenager. When he turned 20 in 1829, his parents sent him on a three-year journey to advance his career and to expose him to the rich cultural life and sights of Europe. The String Quartet in E Flat Major, Op. 12, composed in Great Britain, reflects the happiness and success he was experiencing during this adventure. It will be performed by violinists Mauricio Aguiar and Timothy Lees, colleagues in the Cincinnati Symphony; Laurie Kennedy, principal violist of the Portland Symphony; and Bonnie Thron, principal cellist of the North Carolina Symphony.

Next on the program is Carl Maria von Weber’s Clarinet Quintet in B-Flat Major, Op. 34. Like most great works for the clarinet — those by Mozart and Brahms, for example, — Weber composed this quintet to showcase the virtuosic skills of a particular musician. Carmelo Galante, principal clarinetist of the Omaha Symphony, will perform this showpiece, joined by Lees, Aguiar, Kennedy and Thron.

By the time Mendelssohn wrote his Piano Trio No. 2 in C Minor, Op. 66 in 1845, he had completed eight concert tours to England. He was conductor of the Gewandhaus Orchestra in Leipzig and founding director of a new conservatory, and was in demand as conductor and performer of his own music. He was also in a state of exhaustion. Despite a year’s vacation, during which he composed the trio, his health continued to deteriorate until his untimely death two years later. This trio, written at the peak of his creative life, will feature Lees, Thron and pianist Mihae Lee, who has appeared at numerous chamber music festivals worldwide.

Tickets for open seating, $20, will be available at the door on a first-come, first-served basis; anyone under 21 admitted free.  Tickets are also available by mail: Sebago-Long Lake Music Festival, P.O. Box 544, Harrison, Maine 04040; and at Books N Things, Bethel; The Cool Moose, Bridgton; The Country Sleigh, Naples and Fare Share, Norway. They may also be purchased  online at www.sebagomusicfestival.org or by calling 583-6747.