Show current letter when dragging scrollbar on large lists

Feature description:

Add a ‘letter bubble’ when dragging the scrollbar to highlight where the user is on the list.

Problem solved:

When scrolling a large list it’s a bit of pain to keep stopping/slowing down scrolling to find where you are on the list.

Brought benefits:

Quickly see where you are in the list without having to slow scrolling large lists etc. Makes locating artists/songs quicker and more intuitive.

Other application solutions:

Contacts app on android : example here

Screenshots / Mockup:

Unfortunately this is not really possible, the all load content dynamically so when you fast scroll the data might not be loaded and there’s nothing to display.

Furthermore this only work for one sort over the dozens supported.