Walk the Line (2005)
Chosen by me from a list of DVDs Victoria Charvill was giving away.
Dull, dull, dull.
Some great music (though I'm fonder of the later period Cash this movie doesn't cover) and good performances but everything is so rigidly formulaic. You could swap the names and songs for anybody you wanted for all the difference it would make.
It plays a little Quantum Leap game with appearances from Elvis, Jerry Lee Lewis and Roy Orbison but is so trite and rote that nothing really sticks in the memory.