Well done Wolfgang & Greg

200-300 - FALSE. Ctesibius of Alexandria invented the organ about 246 BC. However, it was introduced into Christian services around 200 ad. There's a description on this page. at least I assume you were going to say false

1000-1100 - TRUE. Guido d'Arezzo (c991AD-c1033AD) was also the first to use a 4 line stave for recording a tune. Before that, a single line was used with symbols depicting how far above or below the line the note was. There is some useful information here.

Wot about the bells, though?

:-)