The song "It's So Hard To Say Goodbye To Yesterday" was specifically written for the Motown movie Cooley High and presumably for the funeral scene in which it was used.
Although the world does not look kindly upon men crying I have always felt/joked that any man who bawls upon hearing this song gets a pass.
The husband-wife songwriting duo of Freddie Perren and Christine Yarian Perren wrote this song. Plenty of people have recorded the song, most famously Boyz II Men, but I still think the film version, sung by G.C. Cameron, is the absolute definitive version, bar none.
As a man of a certain age I am at the point where many of my older relatives have passed on. To me this song expresses the loss of loved ones while acknowledging that no matter what, life continues.