These two MADs only share K-ON! and especially impressive production qualities in common, but otherwise are very different in most other respects.
The first is a wonderfully edited MAD of the K-ON! cast set to a catchy J-Pop song, while the second is a hand-drawn version of “Don’t say ‘lazy'” featuring the youthful starlets of Idol Master.
けいおん！ 『さくらんぼ！』 / K-ON! “Sakuranbo”
Before anyone asks – the song is さくらんぼ / Sakuranbo (Cherry) by 大塚愛 / Ai Otsuka.
アイマス×けいおん!ED / Idol Master x K-ON! ED