Step on up: One of many pianos at the event beckoning attendees to tickle the ivories. | Source: Amanda Andrade-Rhoades/The StandardThe SF Botanical Garden is transformed into an alfresco concert hall. | Source: Amanda Andrade-Rhoades/The StandardPeople make boutonnieres with dahlias at a display booth on opening weekend. | Source: Amanda Andrade-Rhoades/The StandardNow a Bay Area resident, pianist Alejandro del Valle has performed in more than 20 countries. | Source: Amanda Andrade-Rhoades/The StandardSan Francisco-based Orquesta La Moderna Tradición performs on opening night. | Source: Amanda Andrade-Rhoades/The StandardThis year's concert series spans two weekends, culminating on Sept. 22. | Source: Amanda Andrade-Rhoades/The StandardAdmission for the event is included in a general admission ticket for the garden. | Source: Amanda Andrade-Rhoades/The Standard