High Definition music television channel MTVN HD is broadcasting a show called "Montreux Jazz Festival 2003" over the coming days and Jamiroquai are one of the artists listed in the description of the show.

In the UK there are broadcasts on 21, 24 and 28 March and also on 6 April.  I don't know how the channel differs in different regions/countries so check television listings for more information.  In addition to the MTVN HD site, there's also information about the channel and its coverage over at Wikipedia.

Of course, if you want to watch Jamiroquai's entire 2003 Montreux concert performance in high definition then it will be released on blu-ray in May.