Forever Entertainment has marked down their entire catalogue of apps, so you know you can pick up the entire suite for free for a few days. All things told, there are about 13 different titles, spread over between lite and full versions, over iPhone, iPad, and Mac editions.
Forever Entertainment’s games have a mixed record, some of which are very highly rated, some of which are pretty poor. So before downloading, make sure to have a read over some of the reviews, and get a feel for if its worth your time — even if it is free. The “Frederic – Resurrection of Music” series seem to be a decent choice. Here are a couple of titles that seem to be thought of as pretty good: