Re: "Higher", the Sly box set.
There is almost a CD worth of unreleased and/or live tracks. It was worth the price of admission in my book. But, you already own most of this already. I'm not sure if all the rare stuff can be downloaded as individual tracks. The remastering is the same as the complete album set that came out about a year ago.
Re: Valerie June
She is a unique talent. She calls her sound "Organic Moonshine Roots Music": Country meets Soul meets Gospel meets Blues. I caught her live and was knocked out!