"What'cha Gonna Do" by Sons Of Champlin

Sons of Champlin was formed by singer and songwriter Bill Champlin in San Francisco while he was still in high school. The band managed to crack the Top 100 twice in the 70s with "Hold On" (#47) and "Here Is Where Your Love Begins" (#80).

Champlin left for a brief career as a solo artist, managing to score two more Top 100 hits: "Tonight Tonight" (#55) and "Sara" (#61) from 1982. He then joined Chicago and delivered some monster hits like "Hard Habit To Break," "Look Away," "You're Not Alone," and more. 

Champlin's son, Will, also tasted Top 100 success. In 2013, his cover of "At Last" from the TV show The Voice, peaked at #83.

Listening to the grooves by Sons of Champlin draws clear parallels to what Chicago was doing at the time. Check out "What'cha Gonna Do" from their 1977 album, "Loving Is Why."