These lesser-known cuts show that Juan Luis Guerra has continued to be an innovator in merengue even late into his career. While 2010's “La Calle” offers a quick rhythmic style that flirts with rap rock, “Cancioncita de Amor” is a slow jam full of unexpected angles, zigzagging keys and ricocheting drums. “Si No Te Hubieras Ido” even combines nostalgic keys and strings with a riff that's indebted to the blues.