Trying Any Component feature usage to reduce repetitive code. See aia file and url. Screen1 colour_buttons works OK. Screen1 code plays the note sequence listed for the three buttons. Screen2 attempts at Any-Component code for identical operation not successful. http://ai2.appinventor.mit.edu/reference/other/any-component-blocks.html
My grandfather, when asked for directions to somewhere, always asked where the person had come from. Following their response, he said "I wouldn't have started from there..."
Perhaps consider the following blocks approach for your first screen as an example, which you can develop on from here. the key is to use only one player, and iterate over a list of notes...