How do I unserialize this?

Correct serialized string will be:

a:1:{i:0;a:3:{s:4:"name";s:56:"Song → Black Meen : “So Clean (feat. Dullaah Jin)”";s:4:"file";s:93:"http://localhost/peace.worldwide/wp-content/uploads/2013/05/03-So-Clean-feat.-Dullaah-Jin.mp3";s:9:"condition";s:3:"all";}}

The second long string ( value of key “file” ) had incorrect lenght 98 which should be 93. You might ask why the first long string ( value of key “name” ) has lenght of 56. It looks like it should be 50. This string contains three special characters ( → “ and ” ) and their lenghts are 3 each therefore final length is 50 + ( 3 * 2 ) = 56.