  In this note we consider a question of Ono, concerning which spaces of
classical modular forms can be generated by sums of $\eta$-quotients. We give
some new examples of spaces of modular forms which can be generated as sums of
$\eta$-quotients, and show that we can write all modular forms of level
$\Gamma_0(N)$ as rational functions of $\eta$-products.
