What happens when a DJ designs a hotel. Music theme starts with the name (Beats Per Minute), continues on with custom soundtrack that streams through common spaces and guest rooms. (Attention to detail: the bathrooms have speakers, too.) Equalizer serves as logo, with spring-green and black color scheme picked up in 76 boutique spaces. Youthful focus, with pulsating lobby at social hours. Express trains nearby for quick and easy Manhattan access. Moderate prices.