Energy is an uncountable noun. However, we can count the different types of energy (i.e. hydro [energy] and wind energy). Therefore, we should write: "Hydro and wind energy are not as widely used as other energy sources."
Music (singular mass noun) IS my life. Art (singular mass noun) IS my passion.
Music and art (TWO singular mass nouns) ARE my life and passion.
I hope this helps.