I don't know if the songs can be included here but...
"I remember now, like it weas yesterday
She would hold me close, and then I hear her say
You know I'll never leave you, you can fine me everywhere
In a morning light, the evening star...
I'm always there..."
That always makes me cry, it holds connection with the saddest scene in the franschise and it's so well performed!
I still don't understand people who hate LBT songs
But as for crying scenes(not just sad scenes) I'd say from movie 4, when Littlefoot's grandfather was dying