Blaming Someone and Accusing Someone

We all have to blame and accusing someone, right? Do you know the difference? Let's we talk about Blaming and Accusing Someone...
In that way, Blaming and Accusing almost has similarity. But, I always thought that Blame was definite than accuse. For example: How could you do such a thing? (Blaming). No one else could do such a thing, but him (Accusing) 

There's song contains Blaming sentence, for example Avril Lavigne (Smile)
Yo-u said "Hey, What's your name? " 
It took one look And now we're not the same 
Yeah you said "Hey." And since that day You stole my heart 
And you're the one to blame 

 Noted for yourself: never accuse someone for something without any proof or evidence ☻