You can hear the baseline first, melodic and uptempo, backed by a solid drum beat. Then come the vocals, soulful and true. A keyboard lays down some sweet chords, with accents on guitar. The music swells, a horn section chimes in, until the song is in full swing. It’s rocking. It’s fresh. And it’s yet another amazing cover…“The Door,” by Teddy Swims, performed by The Graystones.

The biggest surprise for most people when they see this band is the size of the musicians. In fact, the nine members range in age from 11 to 15 (most of them are 12). To call them a “kid band,” however, might imply a lower quality, which could not be further from the truth. While slight in stature, The Graystones create a big and complex sound.

A small stage in the middle of San Jose’s upscale Santana Row has bee

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