His next few singles were not successful; his voice was changing as he got older and Motown was considering cancelling his contract. To save him, a fresh single "Up-Tight", co-written with Wonder was recorded in 1965 with reports saying it was based on a rhythm he had been humming and during recording the lyrics were sung back to Wonder as they were unavailable in Braille and that he "never missed a beat". The single charted at No.1 and an album was rushed into production the following year to back it success. This established Wonder as a genuine Motown hitmaker. Since then, he has used a Hohner clavinet.