Tutorial polish

[rgalanakis]

• [x] After maybe 30 seconds, a 'hand pressing button' icon should appear over the 'play' button. Otherwise, people may not realize there are other songs.
• [x] The animation of the hand-drag icon should be changed to make it 'press', then drag. May require a new icon and not just an animation change.
• [x] About 10 seconds after the first song change, a 'hand pressing button' icon should appear over a section button. Otherwise people can easily overlook this feature.

[bmumm]

We finished this in beta closing it out.