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Java Java Data Structures - Retired Efficiency! Implement Chooser UI

Error when compiling

Hello, When i try to compile the files i get this error msg :

./com/teamtreehouse/KaraokeMachine.java:94: error: incompatible types: Song cannot be converted to List<Song>                                                                             
./com/teamtreehouse/KaraokeMachine.java:94: error: incompatible types: List<String> cannot be converted to List<Song>                                                                     
    List<Song> songs = mSongBook.getSongsForArtist(artist);                                                                                                                               
                                                  ^                                                                                                                                       
./com/teamtreehouse/model/SongBook.java:43: error: incompatible types: List<Song> cannot be converted to List<String>                                                                     
    return byArtist().get(artistName);                                                                                                                                                    
                         ^  

Any help please.

What does like 43 look like in the SongBook.java?

ah, it's my bad, instead of List(Song) i used List(String)