There might never be a more apt title for a album than “Evolve,” the jam masters' 16th studio album and first in over four years. Just as this boundary-pushing quartet has progressed over four-plus decades by fusing rock, jazz, bluegrass and other freewheeling sounds, “Evolve” has a familiarly amorphous feel. Because Phish’s fiercely dedicated fan base is rooted in the experiential immersion of the live shows — no two nights are the same — this actual album drop could be considered an afterthought compared to other bands.

Many of the 12 tracks on “Evolve" have been in rotation at their shows throughout the last few years. More than half of them were played in April over their in Las Vegas. Still, “Evolve” starts strong enough to hook both a Phish skeptic and the diehard who's been to two dozen shows.

The bouncy opener, “Hey Stranger,” rides a catchy staccato beat and minor-key melody into a vintage jam by frontman/guitarist Trey Anastasio and drummer Jon Fishman; it's easy to imagine this one peppering a sold-out Madison Square Garden performance. Anastasio has that he believes the band is just hitting its stride as the members move into their 60s, and this album gives plenty of reason to keep it going. The energy and urgency persist throughout the first few songs, from “Hey Stranger” into the bluesy “Oblivion” and then onto the title track.

The latter is the ideal opportunity for the uninitiated listener to join the fun, with its sweet melody,.