SOLID SPRUCE TOP EXOTIC MAHOGANY CONCERT, KA-SSEM-C New for 2019, the Solid Spruce Exotic Mahogany Series comes in concert and tenor models. Spruce has a broad dynamic range that works well for both strumming and fingerpicking. Spruce? s consistent, clear, balanced, and robust tone pairs well with the resonance, midrange frequencies, and quick response of Exotic Mahogany. Available in concert and tenor models.