 On Oahu, pianist Grant Carvalho will be playing at Signature Steak and Seafood atop the Ala Moana Hotel tomorrow and Saturday, starting at 6. Pianist and vocalist Maggie Herron is at Lures Lounge in Hale Kulani Hotel every Friday and Saturday, starting at 8.30. Honolulu Beer Works at 328 Cook Street presents vocalist Mihoko M. and the Hepcats, 6.30 to 9.00 p.m. Saturday.