Leading Irish violinist Patricia Treacy will play during a private mass for president-elect Joe Biden and his family before his inauguration tomorrow.
There had been concerns there would not be any live music at the mass because of the riot at the Capitol earlier this month.
The invitation for Patricia to play on inauguration day came directly to her from the Biden family last year.
She said: "I am going to be playing in the church with the family present."
Over the weekend, she practised in Chicago for what she described as "a once-in-a-lifetime opportunity". The main piece she will be performing is The Proclamation composed by Patrick Cassidy.
Patricia will be playing a 315-year-old Stradivarius violin, from Joe Bein and Company in Chicago, estimated to be worth $4m (€3.3m).
She will also join Soprano Renée Fleming for On Eagle's Wings, Schubert's Ave Maria and the Celtic Alleluia.
"I have been told this will be the only live music event on the day," she added.
Patricia, from Co Louth, has played for the president-elect on a number of occasions, including when he visited his ancestral home in 2016. She was also asked to perform at some of the Biden rallies in Chicago and other cities.
When she was asked to play at the inauguration, she said: "I feel both honoured and privileged and obviously super excited."
Despite security concerns following the riot in Washington DC, Patricia said it has been confirmed she will be playing live.
It is understood the mass is private, with only immediate family present. Afterwards, Mr Biden and his family will make their way to the Capitol for the inauguration.
She said: "This is a once-in-a-lifetime opportunity to be able to perform for the inaugural mass for the president-elect and his amazing family, which I have become very close to.
"I am hugely honoured to be a part of this momentous, historical occasion."
Patricia said her jewellery will be "diamonds and sapphires from Martin Katz Jewels in Beverly Hills".
He is known as the jeweller to the stars and his wife, Kelly, is the former chairman of the Kennedy Centre Board for the performing arts. Patricia performed for the board in September 2019.
Her blue dress is from Dimitra's, Chicago and was designed by Alex Teih. The colour complements the jewellery, which is worth $3m (€2.5m) and was transported to Patricia in an armoured car.