Notes Taking Along with Audio

Hello, so my kids are attending Suzuki music school, which means that I am sitting behind them and taking notes. Meanwhile I need to record what's happening, because sometimes it's too hard to write it down.

Can you recommend any app (preferably android, but PC too) to help me show my kids the results of this note-taking along with references to the recording (at 3:45 teachers shows how to vibrate etc.)