Currently on Netflix in the UK (not sure about anywhere else)

"The story follows Vince, a desperate former pop star who dreams of making a comeback. An impromptu jam session with autistic young drummer Stevie sparks an unexpected friendship between the two misunderstood musicians."

A lot of the reviews have mentioned that this is a good "Sunday Afternoon" movie and I would agree with them.
This is not a heavy rollercoaster ride with high drama, it's a nice story about an unlikely friendship and what both of them get out of it.
There are a couple of really forced moments which take you out of it a bit, but overall I found the story to be engaging and uplifting and it had some solid acting to boot.

So if you have a couple of hours spare on a Sunday afternoon, I would recommend giving this simple yet surprisingly good movie a go.