The Ink Spots and the Mills Brothers (they were still putting out hits when I got into radio in the late 1960's) smoothed the way for the Platters. But the Platters were the first African-American combo of the early rhythm and blues years to achieve mainstream success on the pop charts with a song that was not either a novelty or a jump-blues number.
While not as well known as their later work, the song that turned the Platters into a nationally acclaimed act was Only You (And You Alone) from July 1955.
That song made it to #5 in the USA and #18 in the UK before it was done climbing the charts. You gotta love this classy group. The Platters had twenty-three hits in the USA. My favorite of that run of twenty-three is the classic below.
Steven L. Smith
Bellingham WA Home Inspections