There are encores and encores – most a friendly, minimal farewell gesture from the soloist; some a jolly, festive unwind after a particularly taxing piece. And then there’s the luxury free gift that Sir András Schiff bestowed on us during the second of two Barbican concerts with Iván Fischer and his Budapest Festival Orchestra.

This family concert – “Total Immersion: Lift Off!” – was basically a small-scale rerun of this year’s CBeebies Prom, that one entitled “Off to the Moon”. The Prom had a space theme, to mark the 50th anniversary of the Apollo 11 moon landing, and this Barbican concert just came in under the wire, still in the anniversary year, even if the commemorative events from the date itself, back in July, now seem distant.

Given the number of audience members playing air-piano along with parts of Pictures at an Exhibition, Behzod Abduraimov should perhaps be described as a pianist’s pianist. He is nevertheless a great deal more than that. Ten years ago this young musician from Uzbekistan, via Kansas City, emerged victorious from the last-ever London International Piano Competition; he was 18 then and if his artistic growth thus far is anything to go by, we are dealing here with a rare and enchanting musician.

When celebrated individuals get together to play chamber music on special occasions, the result can often turn out as what the late cellist of the Borodin Quartet, Valentin Berlinsky, disparagingly called "festival quality" – meaning a clash, rather than a blend, of personalities. That was never the case for a moment in the opening concert of the eighth Highgate International Chamber Music Festival.

The theremin is still a relatively rare visitor to concert halls, particularly in a solo role, but Carolina Eyck is changing that. Her instrument, invented by Lev Termen just 100 years ago, is a relatively simple piece of kit – a tone generator controlled by the player’s hands, which never touch it but rather appear to be conjuring sound out of thin air.

There aren’t many musicians who could appear as composer, singer and violist on a single programme but that was Caroline Shaw’s lot last night.

The megastars are here at the Barbican, for an intensive three days in the case of the LA Phil and Gustavo Dudamel, throughout the season as the hall shines an "Artist Spotlight" on pianist Yuja Wang. Despite a shallow opener showcasing the individual talents of the Los Angeles principals and daft, rollicking Sousa at the end, there was a seriousness of intent and depth of focus that belied the touring glitz.

If you're going to run a music festival with flair, it's not enough just to have a run of star performers who pop up for single events. The 11th Wimbledon International Music Festival can offer those – Christian Tetzlaff and Lars Vogt, for instance, were there a week ago.

For better or worse, because of Visconti’s classic film the Adagietto of Mahler’s Fifth Symphony now inevitably means Venice in its gloomiest moods. So there turned out to be a grim timeliness in a performance on an evening that coincided with the most devastating “acqua alta” to flood the city in half a century. Yet, in keeping with everything he does with the London Philharmonia Orchestra, Vladimir Jurowski’s reading at the Royal Festival Hall made us think afresh about an iconic work and dispel its more hackneyed, reach-me-down associations.

Switch off for a phrase or two and it’s easy to miss the point in a Haydn symphony that makes each one of them odd and unique. In No. 74, played last night with understated class by the English Chamber Orchestra, that point occurs in the first movement, at the end of the second theme. All has gone just as you’d expect.