The Lower East Side is losing another one of its live music venues afterFontana’s, the massivegrungy-chicbar and concert hall, closes at the end of March. Rent hikes areonce again to blame — the bar’s owners would’ve had topaymore than $30,000 a month under theirnewlease, according to The Low Down.”We set out to operate a neighborhood rock bar, and that has become economically unfeasible,”the proprietors tell the website. A diveythrowback in the gentrifyingneighborhood, Fontana’s has beena favoriteamong music fans, trivia buffs and anyone in need of a $3 beer specialfor 12 years. Raise a glass at one of theirthree barsand get in a round of pool while you can.