楽
This Chinese character means ease, easy, pleasant, happy, enjoy.
You can watch how to write this. - (「楽」の書き順（筆順）動画 - 漢字書き順辞典)
There are 4 ways to read this, "がく" or "らくな (楽な)" or "たのしい (楽しい)" or "たのしむ (楽しむ)".
"音楽 (おんがく)" means music.
"楽な (らくな)" is "な" adjective which means ease, easy.
"楽しい (たのしい)" is "い" adjective which means pleasant, happy.
"楽しむ (たのしむ)" is a verb which means enjoy.
"楽（らく）あれば苦（く）あり" is a Japanese proverb which means "Pain and pleasure are two sides of a coin."
By Higashi-Mikawa Kyōjindō Shujin (東三河狂人堂主人)