Her song repertoire, which she often performed with pianist Jozef De Beenhouwer, was also very extensive, ranging from Purcell to contemporary composers.

She also sang many works by Belgian composers, such as Peter Benoit, René Defossez [nl], Jef van Hoof, Marinus De Jong, Willem Kersters, Lodewijk Mortelmans, Lodewijk Mortelmans, Flor Peeters and David Van de Woestijne [nl].

She performed in Israel, Japan, Canada and the Soviet Union, but of course mainly in Western Europe, and particularly in the German-speaking part, alongside Belgium and the Netherlands.

She worked with conductors Léonce Gras, Felix de Nobel, Karl Richter, Peter Schreier, also Herbert Blomstedt, Eduard Flipse, John Eliot Gardiner, Nikolaus Harnoncourt, Christopher Hogwood, Heinrich Hollreiser, Ferdinand Leitner, Igor Markevitch, Georges Prêtre, Gennady Rozhdestvensky, Paul Sacher, Leif Segerstam, Hans Swarowsky, Michael Tilson Thomas and André Vandernoot.

[5] On the occasion of her 75th birthday, Ria Bollen was solemnly received on 10 April 2017 in the Antwerp City Hall and honoured by Mayor Bart De Wever.