Were they Jewish?

[Fred Blumenthal <xd2fabl...>]

Biographical information about Jakob ("Jacques") Blumenthal indicates that 
he was pianist in residence to Queen Victoria and Prince Albert.  Born in 
Germany and educated in France, he was also a composer of songs, piano 
solos and at least a little bit of chamber music.  But does anybody know 
if he was Jewish?  The question isn't absurd, since Queen Victoria did 
also employ Mr. Disraeli.

Also, a radio announcer (not usually a dependable source of information) 
recently commented that when Frederick Delius lived in Florida, he sang in 
a synagogue.  Does anybody know if he was Jewish?  (Singers in Reform 
temples have often been gentile - especially before the renaissance of 
cantorial singing there.)

Fred Blumenthal
xd2fabl (at) us(dot)ibm(dot)com