Per the artist official homepage, http://www.a-ha.com, the band's name is spelled all lower case.
Discussion about capitalization of the title "Take On Me": http://forums.musicbrainz.org/viewtopic.php?id=771
A-ha (stylized a-ha; Norwegian pronunciation: [ˈɑːhɑ]) was a Norwegian pop band formed in Oslo in 1982. The band was founded by Morten Harket (vocals), Magne Furuholmen (keyboards) and Pål Waaktaar (guitars). The group initially rose to fame during the mid-1980s after being discovered by musician and producer John Ratcliff, and had continued global success in the 1990s and 2000s.Continue reading at Wikipedia...
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