Why does my downloaded MP3 files need to be unziped?
Right, when we download the mp3 files using websites like youtube to mp3 etc etc they provide us mp3 songs in zip files. so in order to avoid it, you need to follow few below steps. 

first click on SETTING

then go for DOWNLOAD SETTINGS

then at the end there is an option names MORE OPTIONS

Just check the DOWNLOAD DIRECTLY

that's it, it will solve your issue