The DaPonte String Quartet has launched its 25th Summer Season, featuring performances taking place in the Midcoast and beyond.

Series I, “Clarinet Envy,” a pair of classic clarinet quintets featuring guest artist Mark Dover, will run through July 13 in Tenants Harbor, South Bristol, Harpswell and the Coastal Maine Botanical Gardens in Boothbay. Series II, “Then and Now,” features a world premier commissioned by the DaPonte String Quartet and works by Bach and Mendelssohn. It will be performed from July 23 through Aug. 13 in Tenants Harbor, South Bristol, Harpswell, the Coastal Maine Botanical Gardens in Boothbay, Stonington, Richmond and Chebeague Island.

Series I consists of Mozart’s Quintet in A Major and Brahms’s “Quintet in B Minor Op. 115.” Clarinetist Mark Dover, a member of Grammy-nominated Imani Winds, calls these quintets “two of the greatest chamber works ever composed.” Both pieces were written at the peak of the composer’s power, and Dover said clarinetists are “deeply thankful to have these two masterpieces in our repertoire.”

Series II features the world premier of Dutch-born composer Rocco Havelaar’s Quartet No. 3, as well as J.S. Bach’s Three Contrapuncti from “The Art of Fugue,” and Mendelssohn’s “Quartet in F Minor Op. 80.” Written toward the end of his life, “The Art of Fugue” is the culmination of Bach’s experimentation with monothematic instrumental works. Mendelssohn’s quartet was an homage to his sister Fanny, a gifted composer in her own right. Havelaar says his work is inspired by Brahms and late Beethoven.

Performances of “Clarinet Envy,” each of which take place at 7:30 p.m.:

• July 12 at Centennial Hall, 936 Harpswell Neck Rd., Harpswell; tickets $25;

• July 13 at the Visitor Center, Coastal Maine Botanical Gardens, Boothbay; tickets $25.

Performances of “Then and Now” are:

• July 23 (minus the Havelaar), 2 p.m. at the Dresden-Richmond United Methodist Church, 121 Pleasant St., Richmond. Tickets $20. Under 21 free. For information, call (207) 737-8202.

• July 26, 7 p.m. at the Burnt Cove Church Community Ctr., Stonington; tickets $22 from Opera House Arts, 367-2788.

• Aug. 2, 7:30 p.m. at Ocean View Grange Hall, 435 Port Clyde Rd., Tenants Harbor; tickets $25.

• Aug. 4, 7:30 p.m. at the Union Church, Middle Rd., So. Bristol; tickets $25.

• Aug. 9, 7:30 p.m. at Centennial Hall, 936 Harpswell Neck Road, Harpswell; tickets $25 online; pay what you wish at the door;

• Aug. 10, 7:30 p.m. at the Visitor Center, Coastal Maine Botanical Gardens, Boothbay; tickets $25; and

• Aug. 13 at 7 p.m. at the Chebeague Island Methodist Church, 258 North Road, Chebeague Island; free concert; information: (207) 846-7829.

The DaPonte String Quartet is entering its 25th year. Founded in 1991 in Philadelphia, it moved to Maine more than 20 years ago and now performs over 60 concerts a year, year round, from Presque Isle to Ogunquit.

Tickets and further information can be found at DaPonte.org; tickets to some concerts are also for sale at Gulf of Maine Books, Brunswick; Sherman’s Books in Damariscotta and Boothbay Harbor or by calling (207) 529-4555.