“Hold On” is a song from the album John Lennon/Plastic Ono Band by John Lennon released in 1970 (my first year in college.) I’ve always liked this song but I don’t know how it came into my head just now, except that I find it very reassuring and especially comforting for these troubling times. The music alone is soothing, but then Lennon adds words like these:
It’s gonna be alright
You’re gonna win the fight
You’re gonna see the light
So hold on
Lennon has explained the song as follows:
“Hold on now, we might have a cup of tea, we might get a moment’s happiness any minute now. So that’s what it’s about, just moment by moment. That’s how we’re living now, but really living like that and cherishing each day, and dreading it too. It might be your last.” 
I’m not even going to try to add any more comments to his.
This performance is dedicated to Yoko in memory of John.
1. Rogan, J. (1997). The Complete Guide to the Music of John Lennon. Omnibus Press. pp. 38–39. ISBN 0711955999.