The DaPonte String Quartet continues its 25th Summer Season with “Then and Now,” a seven-concert series that runs through classical music from its earliest foundations to a fresh, contemporary work. The program includes a world premier commissioned by the DaPonte String Quartet and works by Bach, Beethoven and Mendelssohn. It will be performed from July 23 through Aug.13 in new venues as well as familiar ones in Tenants Harbor, South Bristol, Harpswell, the Coastal Maine Botanical Gardens in Boothbay, and Stonington.

Performances of “Then and Now” are:

• July 23 (Bach & Beethoven), 2 p.m. at the Dresden-Richmond United Methodist Church, 121 Pleasant St., Richmond. Tickets $20. Under 21 free. (207) 737-8202.

• July 26 (Bach, Havelaar & Beethoven), 7 p.m. at the Burnt Cove Church Community Center, Stonington; tickets $22 from Opera House Arts, (207) 367-2788.

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

• Aug. 4 (Bach, Havelaar & Mendelssohn), 7:30 p.m. at the Union Church, Middle Rd., South Bristol; tickets $25.

• Aug. 9 (Bach, Havelaar & Mendelssohn), 7:30 p.m. at Centennial Hall, 936 Harpswell Neck Rd., Harpswell; tickets $25 online; pay what you wish at the door;

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

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

The DaPonte String Quartet was 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.