Questions & Answers about Живой концерт радует меня.
In Russian, the form я is the subject (nominative case), and меня is one of the object forms (accusative / genitive).
The verb радовать answers the question кого? что? (“whom? what?”), so it takes a direct object in the accusative case:
- Живой концерт радует меня.
концерт = subject (nominative)
радует = verb
меня = direct object (accusative)
If you used я, the sentence would be ungrammatical, because я cannot function as a direct object here.