What is Björn Ulvaeus?
{{Infobox person | name = Björn Ulvaeus | image = Björn Ulvaeus 2023 (53338026438) (cropped).jpg | caption = Björn Ulvaeus in November 2023. | image_size = <!-- Only for images narrower than 220 pixels --> | birth_name = Björn Kristian Ulvaeus | birth_date = {{birth date and age|df=y|1945|04|25}} | birth_place = [[Gothenburg]], [[Sweden]] | nationality = Swedish | alma_mater = [[Lund University]] | occupation = {{flatlist| *Songwriter *composer *musician *singer *guitarist *producer *writer *musical director }} | years_active = 1963–present | height = {{height|ft=5|in=9}} | spouse = {{marriage|[[Agnetha Fältskog]]<br>|1971|1980|end=divorced}}<br>{{marriage|Lena Källersjö<br>|1981}} | children = 4, including [[Linda Ulvaeus|Linda]] and [[Christian Ulvaeus|Peter Christian Ulvaeus]] | parents = Aina Ulvaeus<br>Erik Gunnar Ulvaeus | relations = | module = {{Infobox musical artist|embed=yes | background = solo_singer | genre = {{flatlist| *[[Europop]] *[[folk rock]] *[[Swedish folk music|Swedish folk]] *rock *[[Euro disco]] *[[schlager]] }} | label = {{flatlist| *[[Polar Music]] *[[RCA Victor]] *[[Atlantic Records|Atlantic]] *[[Epic Records|Epic]] *[[Polydor]] *[[Polygram]] *[[Universal Music]] }} | instrument = {{flatlist| *Guitar *[[vocals]] }} | associated_acts = {{flatlist| *[[ABBA]] *[[Hootenanny Singers]] *[[Benny Andersson]] }} }} | signature = Björn Ulvaeus signature.svg | website = }} '''Björn Kristian Ulvaeus''' (credited as '''Björn Ulvæus''' {{IPA-sv|bjœːɳ ɵlˈveːɵs}}; born 25 April 1945)<ref>{{YouTube|uYAwAfYnjPw|Come out and vote!}}, Ulvaeus pronounces his name at 0:08, Retrieved 31 May 2017</ref> is a [[Sweden|Swedish]] songwriter, producer, a former member of the Swedish musical group [[ABBA]] (1972–1982), and co-composer of the musicals ''[[Chess (musical)|Chess]]'', ''[[Kristina från Duvemåla]]'', and ''[[Mamma Mia!]]