Not one of the least known songs on youtube but this is my favourite video of Marvin and Tammi doing this classic.
There is another video of this tune up on youtube but it seems a bit more commercial; slicker production and a bit of a staged feeling. This one looks like it is recorded live and the chemistry between the two of them really comes through.
This one has about a million and a half views so it is hardly unknown but the other is at nearly 9 million so it is probably the one everyone has seen.

Marvin Gaye Sings With ....
This isn’t an uncommon tune, it sold in its millions, but it did have a bit of a revival on the Northern Soul scene a couple of years ago and got to about £25 in price for a US issue – £10 to £15 is about right though.
For the elitists; the copy to have (if you can’t get the UK Green and White demo) is this Aussie EP – Marvin Gaye Sings with Tammi Terrell, Mary Wells and Kim Weston.
Sorry about that blatant chuff about having this EP but I just can’t help myself at times !