During the early years of the band, Cuevas only wrote the lyrics to the songs, as the writing of the music was done by the band's founder and leader Andrés Bobe. During this time, La Ley became one of the most successful groups in the country. In 1994 Bobe died in a motorcycle accident after a benefit show, which forced Beto to become the leader of the group. He went from being the visible face of the group to becoming the main creative force behind it with the help of his bandmates.