When "Los Panchitos" were playing in restaurants and bars in Mexico City, Gualberto Castro, their first cousin, about 13 years old at the time, was auditioning in many venues to become a singer.
Often Arturo would go to interviews with Gualberto as his piano player or musical accompaniment; the cousins knew they could sing well, but they were all having difficulty finding work.
They performed with Paul Anka, Judy Garland, and many entertainers including featured in the French production show Casino de Paris at the Dunes, Las Vegas, produced by Frederick Apcar.
The group also appeared in Cuba, Spain, Puerto Rico, Central America, Argentina.
At that time Jorge Castro left the group to pursue a solo career.