Eurovision Song Contest
In 2004 and 2005 Maas provided the Dutch commentary for the Eurovision Song Contest semi-finals. He took over as regular commentator for the Dutch television in 2006 for both the semi's and the final after the regular Dutch commentator Willem van Beusekom stepped down and subsequently died the week of the contest from colon cancer. In 2006 and 2007 he co-hosted the finals with Paul de Leeuw (who was the spokesperson for the Netherlands). De Leeuw was providing the commentary from the Netherlands via satellite project Olympus. On 29 June 2010 Maas announced he would not be commenting at The 56th Eurovision Song Contest in Düsseldorf, Germany. This was because he had been sacked by the broadcaster TROS (which took over from NOS in 2010). Maas' replacements were his co-host at the 2010 Eurovision Song Contest Daniël Dekker and Dutch singer Jan Smit. In 2014, Maas was recalled again as a Eurovision commentator for the AVROTROS.
On 31 August 2019, Maas was named Creative Advisor for the Eurovision Song Contest 2020 in Rotterdam. He is part of the selection committee for the Dutch entry to the Eurovision Song Contest 2022.
In 2007 Maas was one of the judges for the Dutch version of Just The Two Of Us on TV channel Tien. Maas was a regular guest at De Wereld Draait Door. Since October 2008 he presented a weekly television program Opium for AVROTROS, with 2009 and 2010 Opium specials from the Uitmarkt and Oerol Festival. Maas writes a series about children of divorced parents for de Volkskrant.
- Maas gets sacked by TROS
- "The Netherlands: Mr Eurovision Cornald Maas named ESC2020 creative advisor". 31 August 2019.
- "Selectiecommissie Eurovisie Songfestival op zoek naar inzending 2022". avrotros.nl (in Dutch and English). AVROTROS. 24 May 2021. Retrieved 5 November 2021.