So much is happening in classical music this week, much of it already sold out. Here are a few things for which tickets are still available and that should be of interest.

JUST VISITING:
>> The award for best free concert of the week goes to the Hilliard Ensemble, one of the best choral groups in the world, visiting the Freer Gallery of Art on Wednesday (January 24, 7:30 p.m.). Their program includes music by Arvo Pärt, Jonathan Wild, Alexander Raskotiv, and others (hopefully, a piece from the excellent Gombert recording they released last year). You can try to reserve a ticket through Ticketmaster or show up early to wait on line for one.

>> The runner-up in that category goes to a free concert happening the same night (January 24, 8 p.m.). Yuri Bashmet, pipa player Wu Man, and the Moscow Soloists will play music by Takemitsu, Tan Dun, and Hiyashi at the Library of Congress. Again, Ticketmaster fees or arrive early.

>> After the Kirov Ballet this past week, the Kirov Opera comes to town. Their first production, Rossini’s Il Viaggio a Reims, will open on Saturday (January 27, 7:30 p.m.), with a second performance on Sunday (January 28, 3 p.m.), both in the Kennedy Center Opera House. We have read good things about it.

>> On Friday (January 26, 8 p.m.), the Bulgarian State Opera will bring a production of Puccini’s Tosca to the George Mason University Center for the Arts. All you Puccini-heads out there, go enjoy.

>> Visiting orchestras include the Hamburg Symphony with violinist Robert McDuffie on Wednesday (January 24, 7:30 p.m.), at Strathmore, and the BBC National Orchestra of Wales with pianist Llyr Williams on Sunday (January 28, 4 p.m.) at George Mason University Center for the Arts.

Image of the Hilliard Ensemble