Ah.
[Anthony] Wood compared him several times with the English violinist Davis Mell, who ‘play'd farr sweeter than Baltsar, yet Baltsar's hand was more quick and could run it insensibly to the end of the finger-board’...
At first, Wood thought he had died of ‘the french pox and other distempers’, but subsequently wrote that ‘being much admired by all lovers of musick, his company was therefore desired; and company, especially musicall company, delighting in drinking, made him drink more than ordinary which brought him to his grave’...
Unfortunately little of Baltzar's music survives. He introduced English violinists to high positions, elaborate chordal writing, and scordatura.
And a work list:
16 pieces, vn, in The Division Violin (London, 1684/R), GB-Lbl, Ob, Och
Divisions on John, come kiss me now, G, vn, b, in The Division Violin (London, 1684/R)
2 divisions, d, G, b viol, b, Ob, US-NYp
3 suites, D, c, G, 2 vn, b, GB-Ob
Suite, C, 3 vn, b, Ob; ed. I. Payne (Hereford, 1999)
Set of sonatas, lyra vn, tr vn, b, lost, listed in T. Britton's sale catalogue (London, 1714)
Solos, vn, b, lost, listed in C. Burney's sale catalogue (London, 1814)
Vn solos, pavans etc., lost, listed in J.B. Cramer's sale catalogue (London, 1816)