FIERY Flamenco guitarist Juan Martín brings his virtuoso skills to the L3 Lounge at St David’s Hall next Tuesday (21 June). Starting at 8pm, this captivating concert in the Roots Unearthed series promises a spectacular showcase from a legendary performer, who was once voted one of the top three guitarists in the world by Guitar Player magazine. A native of Andalucía, Juan’s celebrated and highly distinctive compositional style has influenced several generations of artists and led to collaborations with acts…