This morning, I listened to (and watched) the New Year's Day Concert broadcast live from Vienna (the Viennese Philharmonic Orchestra host this event annually and it is broadcast by most of the European state television networks).
Traditionally, it used to focus on the music of the Strauss family (Johann 'the father', Josef, Eduard and Johann 'the son', who was probably the best known and most popular of the dynasty), but, in recent years, the repertoire played by the orchestra has become a lot broader, and now includes work from a swathe of popular (as well as some lesser known) mid to late 19th century composers.
While the exact repertoire played varies from year to year, it usually includes a number of very well known pieces, interspersed with some that are less well known. However, the last two pieces played each New Year's Day are a permanent feature and are expected by the audience (both present and viewing). These are, firstly, the perennial favourite, "The Blue Danube Waltz" by Johann Strauss the Younger, and lastly, the rousing "Radetzky March" penned by his father, Johann Strauss the Elder.