Syracuse, N.Y. — The music is described as diverse but ‘‘old school.’’ The vibe is ‘‘classy and upscale.’’ The rules are strict.

And, at least for now, you have to call in and make a reservation to be seated.

“We want to make this is a nice place where people can come and enjoy themselves,” said Sharon Washington, owner of the new Jus Sum Jazz Lounge off the northern edge of Tipperary Hill. “Leave the nonsense in the world outside.”

Jus Sum Jazz holds its grand opening this weekend at 1965 W. Fayette St. after a week or so of “soft opening” nights.

You can’t miss it: It’s in a big red-brick building a little north of the Erie Boulevard / West Fayette / West Genesee street intersection. And it’s been recently decorated with a large mural of blues legend B.B. King on the front.

That’s appropriate, since Washington, like King, is originally from the Mississippi Delta region south of Memphis, though she admits she has lived in Syracuse “for a long time.”

The lounge’s music offerings will feature lots of jazz, blues, R&B and soul, Washington said, while the jukebox plays a little bit of everything. It’s set up for both live acts and DJs.

“We’re old school, but we want to bring in a diverse crowd,” she said. She plans in the near future to start an