This final concert will be magical. Dating back to the Renaissance, composers have used the Fantasy form to state a musical idea and then let their imaginations run free. The program opens with Ralph Vaughan Williams’ Phantasy Quintet, scored for string quartet with an extra viola. This lyrical, shimmering, ethereal piece of many moods and textures is developed from a single theme.

In startling contrast, Fred Lerdahl’s Waltzes for Violin, Viola, Cello and Bass, is an imaginative contemporary exploration of various waltz forms — 12 in all, requiring extraordinary virtuosity on the part of the musicians. These energetic, fantastic and witty waltzes will take your breath away.

The final presentation will be a performance of Franz Schubert’s monumental Octet in F Major for Strings, Clarinet, Bassoon and Horn. In this grand work, Schubert’s love of melody is front and center in combination with the poignant shifts in mood from melancholic to exuberant, for which he is so revered.

Tickets for the concert at Deertrees are $25. Tickets for anyone 21 and under are free. For more information, visit www.sebagomusicfestival.org or call 207-583-6747.

This program will also be performed at 7:30 p.m. Monday, Aug. 12, at the Leura Hill Eastman Performing Arts Center, Fryeburg.

Leura Hill Eastman Performing Arts Center tickets are $20 adults, $15 seniors 65 and older, and $10 students. For more information, visit www.fryeburgacademy.org/pac or call 207-935-923.