Click the flag Shift-click the flag (Make sure it says "Turbo Mode"). Click the flag. Turn your sound/volume/speaker to a good loudness to hear the song. If you don't like what you're hearing, keep waiting it might sound better, or click flag again
Knowledge of music theory, Scratch's "pick random" and purple blocks. If it doesn't sound like music, it's because each group of notes doesn't flow with the surrounding groups. Try clicking "See Inside" and speeding up the tempo, or hearing the parts one at a time, or make a remix where it makes a chorus, or multiple parts playing at the same time. In the future: Slurring notes will be added and indicated by a comma, eight/sixteenth notes will be added and indicated by a "-" followed by multiple numbers in a single beat item in the list, different instruments will be added, more harmonious music, multiple parts like bass and melody will be playing simultaneously