Why do I get "unexpected token `;'?

Question

I would like to run a few instances of my bash script foo.bash in background.

When I write for i in {1..10}; do ~/bin/foo.bash &am

Answer 1

& and ; are both command separators; you don't need (and can't have) both.

for i in {1..10}; do ~/bin/foo.bash & done