I went for the trial listening and narrowed down my list to two songs, but I still cannot decide which to buy.
I went for the trial listening: 試聴をしてみる
narrowed down my list to two songs: 自分のリストを2つまで絞った
but I still cannot decide which to buy.: しかしどちらを買うか決められない
というのがそれぞれの意味となります。