Austin, Texas-based guitarist and vocalist Jackie Venson performs at The Elbow Room on Wednesday, Oct. 24. Venson, who played piano from her earliest years, took up guitar while a senior at Berklee College of Music in Boston. Since then, she's carved out a unique spot in the musical marketplace, infusing her songs with a blend of blues, R&B and pop. You spend an awful lot of time touring and performing live and I wonder if you feel like R&B-based or blues music is something that has to