Moore points out that Arsenio Rodríguez's conjunto introduced the two-celled bass tumbaos, that moved beyond the simpler, single-cell tresillo structure. This type of bass line has a specific alignment to clave, and contributes melodically to the composition. Rodríguez's brother Raúl Travieso recounted, Rodríguez insisted that his bass players make the bass "sing." Moore states: "This idea of a bass tumbao with a melodic identity unique to a specific arrangement was critical not only to timba, but also to Motown, rock, funk, and other important genres."