(I Know) I'm Losing You

The song "(I Know) I'm Losing You" was a big hit for the Temptations in 1966, #8 on the hot 100.  It was also a big hit for Rod Stewart and The Faces in 1971, climbing to #24 on the Hot 100.  BUT, the third version of the song done by Rare Earth in 1970 was the biggest, climbing to #7 on the chart.  For some reason, the version that sold the most copies is also the most forgotten version today...
listen here