Tone Mason - The Throwback (2004) sampled The Impressions - We Must Be In Love (1970)

Artist:  Tone Mason (featuring Brassmunk, G Stokes and Graph Nobel)
Song:  The Throwback
Year:  2004
Album:  Not Officially Released

This song received a lot of radio play in Toronto back in 2004.

Artist:  J Dilla (featuring Pharoahe Monch)
Song:  Love
Year:  2006
Album:  The Shining

February always marks J Dilla's passing, so this song was just on the radio.

Artist:  The Impressions
Song:  We Must Be In Love
Year:  1970
Album:  Check Out Your Mind!

The Tone Mason sample is the easy one.  It's the two-bar loop at 0:04.  The loop is extended by another two bars for the introduction.  The J Dilla song is harder to break down.  The chorus is the two-bar sample at 1:52.  The rest of the song uses chopped pieces.  The easiest one to hear is the one-bar sample at 1:50 which is heard during the verses.

Hassaan Mackey - War (2007, 2014) sampled Eddie Floyd - Whatcha Gonna Do With My Heart (1973)

Artist:  Hassaan Mackey
Song:  War
Year:  2007, 2014
Album:  Soul For Sale, That Grit

I remember seeing a Youtube video years ago of Kev Brown taking an Eddie Floyd record, chopping up the sample and starting to rhyme on it.  I was pleased to find out that it became a Kev Brown produced song by Hassaan Mackey released in 2007 and re-released in 2014.

Artist:  Eddie Floyd
Song:  Whatcha Gonna Do With My Heart
Year:  1973
Album:  Baby Lay Your Head Down

The sample is a 4-bar loop made up of various pieces.  Bar 1 is the four beats starting at 0:00.  Bar 2 has the 3 beats from 0:05 and 1 beat from 0:09.  Bar 3 is 3 beats from 0:15 then 1 beat from 0:00.  Bar 4 is the same as bar 2.