During the 1960s, Gaudio and his then-songwriting partner, producer Bob Crewe, worked with Valli to craft solo recordings with varying degrees of success. This concept of a major recording artist performing solo in opposition to his or her own group performances was rare in the rock/pop world (Buddy Holly and The Crickets were an exception) and may have given tacit approval to other groups and members of other groups to pursue such a path. The potential to dominate the charts with group and solo recordings was great, and Valli, Gaudio and Crewe occasionally rose to the occasion with both great performances and commercial hits. Valli was the original artist to record the Gaudio-Crewe composition "The Sun Ain't Gonna Shine (Anymore)", a performance that was copied nearly note for note when recorded by The Walker Brothers, an American group based in England. The Walker Brothers version was a huge success. Valli continued to record solo performances and finally reached major success with the release of "Can't Take My Eyes Off You", which reached number two in the charts and was widely recorded by many other artists.