As much as I loved the battle of the bands and the three of them coming together like that, it's kinda hard to take it seriously with Sasha still plotting to "take back control" of their friendship. My guess for why she's so obsessed is because she probably thinks if she's not the one always calling the shots then Anne and Marcy will just leave her behind for good. She needs to understand that the only way to stay friends with them is by having the humility to see her issues and the willingness to work on them. But as long as she maintains she doesn't want to change, things will never really be better between them. Also if you wanna watch the full version of "Heartstomper" it's on Disney's official music youtube channel.