If that’s correct, it’s the only picture of Buxtehude we have. Scarier: some music historians think that the only vocal works we have from Buxtehude are from when he was relatively young and all later ones are lost...

In this painting "Musizierende Gesellschaft"/"Musical Company", 1674 by Johannes (Jan) Voorhout (1647-1723) one can recognize: on the harpsichord composer Johann Adam Reincken (1643 - 1722; can be regarded as the only one with certainty); the man with the sheet music is probably the composer Johann Theile (1646-1724), Johann Philipp Förtsch (1652 - 1732; composer, statesman and doctor) is also mentioned, as well as Buxtehude. In my opinion (after reading many versions) the most likely persons are: the gamba player on the left is Buxtehude (one of his daughter is said not to have been beautiful); on the harpsichord Renicken; Person with the sheet music: most likely Förtsch. [There is no known portrait of Buxtehude that clearly identifies him. Since the rediscovery of the domestic music scene by the Dutch painter Johannes Voorhout in 1674, there have been various attempts to identify Buxtehude in it. In 2008 a portrait of Johann Theile was discovered in the Lübeck City Library, which excludes him as the gamba player. That makes it all the more likely that Buxtehude is the gamba player on the music scene. He plays the notes D and B on his instrument, Buxtehude's initials.] Perhaps musicologists will soon be able to clarify this once and for all.

400 kms are not that much. There are reports of people walking 55km per day during the medieval age, Bach was walking 2 weeks at most.

@@IchiganCS True, however for one performance it is a bit extensive. It just shows how much Bach appreciated and looked up to Buxtehude as a musician.