One of the few younger non-Japanese acts gracing the stage at this weekend's Tokyo Jazz Festival is singer and bassist Esperanza Spalding. Though appearing at the city's main jazz event, the multifaceted 30-year-old musician could just as easily be performing at Fuji Rock Festival or Summer Sonic. Truly hard to categorize, Spalding seamlessly mixes pop, neo-soul and bossa nova into her heady brew.