The 300 streak one is obviously one of the biggest challenges I faced. My advice to you, if you want the easiest route around the medal. Play A Glorious Dawn. It's still hard though. Especially the chorus. But you can listen to the song and play the rhythm of the singing. This doesn't always work but it might with the chorus. Refresh the page too when you lose your streak. It will be out of rhythm from then on if you don't.