Had it taken place a week later, this concert might have gone under the dubious banner of "Valentine's Day Love Classics". But not of the bitty, Raymond Gubbay variety: Vasily Petrenko was absolute master of three late romantic scores which happened to work well together, and Louise Alder – stepping in for an unwell Jennifer France – showed she could surmount a demanding rarity, and carry it off with flying, smiling, self-deprecating colours.

It’s hard to imagine that any London audience this winter will hear more thoroughly gorgeous singing – or more refined musical artistry all round – than Nardus Williams delivered at the Wigmore Hall on Sunday afternoon. This was a magical hour of early-Baroque Italian bliss.

In Finland Tarja Turunen is an institution. There, she’s regarded as a kind of heavy rock-flavoured fusion of Sarah Brightman and Maria Carey. She first came to prominence as the multi-octave singer for symphonic metal kingpins Nightwish but, since they rancorously parted ways with her in 2005, she’s still maintained a strong career.

Young French soprano Clara Barbier Serrano has everything it takes to shine in an overcrowded singers’ world, including vivacious communicative skills – I witnessed those for the first time last Tuesday, when she performed at the Oxford International Song Festival without the score in front of her – attention to detail and a knack of forging unusual programmes beyond the usual song-recital round, commissions included.

Eighteenth century Sweden is the nominal setting for A Masked Ball, but its essence is a unique mixture of Italian testosterone and French opéra-comique elegance. If this concert performance brought it closer to the indiscriminate vitality of early Verdi rather than the experimental shades of the middle period, there was still a huge amount to enjoy, and one stellar performance.

It’s always tempting, at curtain-up in La Traviata, to settle back, half-close one’s eyes, and soak up the familiar without the anxiety of the new. Not this time you won’t. David McVicar’s lavish 2009 text-true staging is being revived with a generally strong, stylish and dependable cast.

It could have been the most electrifying week of the musical year. Alas, Heathrow meltdown kept me from two of Klaus Mäkelä’s Sibelius concerts with his Oslo Philharmonic in Hamburg. But there was still what should have been the grand finale, the heavenstorming Fifth Symphony following Mahler and Lise Davidsen in Berg (and more Sibelius). The euphoria I’d experienced in one live Oslo concert and the Sibelius symphonies on Decca was rekindled.

“It mustn’t be a surface thing. You have to put in the work,” Janet Baker once said. Sandrine Piau’s Wigmore recital of German song followed by French song was the perfect demonstration of that credo in action.

Along with Tangerine Dream and Jean-Michel Jarre, Vangelis is a key figure in the development of - to be loosely colloquial about it – trance and chill-out electronica. His 1970s work was proggy trip music, laced with classical aspirations that later came into their own. Artists from Sven Väth to Air to Enigma owe him a debt, as do those involved in the current boom in soothing electro-classical sounds.

The screen lights up, the Zoom link connects and there, blinking back at you (30% awkward, 70% enthusiastic) is a familiar face. Is it definitely working? Can you hear me? What do we say now? God, I'm getting old. Even after 12 months of conversation through webcams it still feels forced to me; something to one side of real life, simultaneously weird and routine, intimate and alienating, even as memories of the Old Normal grow increasingly remote. Is that a piano? Well, why not, these days?