Sista Monica performs: Blues and soul music, 9:30 p.m. Friday and Saturday at Casanova's on Maui. Call 572-0220. Also 8 p.m. Sunday at the Poi Pounder Room, Kona Surf Resort, Big Island.
Four hands at the piano: Recital by Paul and Kaoru Lyddon includes selections from Dvorak and Brahms, 7:30 p.m. Friday and Saturday, Atherton Performing Arts Studio, Hawaii Public Radio. Admission $15. Call 955-8821.
UH Collegium Musicum: 8 p.m. Friday, UH-Manoa's Music Building, Room 36. Free. Call 956-8742.
Honolulu Symphony: Open rehearsal 10 a.m. to noon Saturday, Blaisdell Concert Hall. Free. Call 524-0815. The Symphony performs with guest conductor Keith Lockhart and violinist Chee Yun 8 p.m. Saturday and 4 p.m. Sunday. Program features Stravinsky's "Symphony in Three Movements" and Lalo's "Symphonie Espagnole." Tickets $10 to $50; $5 seats available. Call 545-4000.
Opera Workshop in concert: Solos, duets and trios from operas by Mozart, Donizetti, Rossini, Smetana, Sondheim and Puccini, 8 p.m. Saturday, Orvis Auditorium. Tickets $5 general, $3 students and seniors. Call 956-8742.
Allegro Concert Orchestra: 1 to 3 p.m. Sunday, Paki Hale, off Kapiolani Park. Program includes works by Mozart, Haydn and Vivaldi. With art display and gourmet desserts. Admission $20 in advance, $25 at the door. Call 955-3439.
Ethnic Music Pau Hana Concert: 3 p.m. Sunday, Orvis Auditorium. Free. Call 956-8742.
California Guitar Trio: The eclectic Trio performs with guest musician and composer Tony Geballe, 4 p.m. Sunday, Academy Theater. Tickets $12 general, $8 students and seniors. Call 532-8700.