Frostwire is fine.
Bascially, just don't be dumb. Here are a few things I use to tell whether or not a file contains a virus.
-If the song or artist is spelled incorrectly
-If there is no length shown
-If there is a different title other than the actual title of the song
-If the length of a song isn't that long but the size is like, over 10,000 KB
-Also, I only download mp3 files
All in all just pay attention to what you're searching and if you're paranoid like me scan each song using your
anti-virus program.