In the 1920s–30s plenas came to be commercially recorded, especially by Manuel "El Canario" Jimenez, who performed old and new songs, supplementing the traditional instruments with piano and horn arrangements. In the 1940s Cesar Concepción popularized a big-band version of plena, lending the genre a new prestige, to some extent at the expense of its proletarian vigor and sauciness. In the 1950s a newly envigorated plena emerged as performed by the smaller band of Rafael Cortijo and vocalist Ismael "Maelo" Rivera, attaining unprecedented popularity and modernizing the plena while recapturing its earthy vitality. Many of Cortijo's plenas present colorful and evocative vignettes of barrio life and lent a new sort of recognition to the dynamic contribution of Afro-Puerto Ricans to the island's culture (and especially music). This period represented the apogee of plena's popularity as a commercial popular music. Unfortunately, Rivera spent much of the 1960s in prison, and the group never regained its former vigor. Nevertheless, the extraordinary massive turnout for Cortijo's funeral in 1981 reflected the beloved singer's enduring popularity. By then, however, plena's popularity had been replaced by that of salsa, although some revivalist groups, such as Plena Libre, continue to perform in their own lively fashion, while "street" plena is also heard on various occasions.