I've done some searching but can't find an answer to these questions, so apologies if they have been answered elsewhere.
First, is there any way to find out if a particular song is in the public domain or if it is protected by copyright?
Second, how long is a song protected by copyright from the date that it is written/published?
Third, is an individuals interpretation/arrangement of a public domain song protected by copyright. More specifically, if I tabbed out an individuals banjo arrangement of a song that was in the public domain, would I be able to post it at Banjohangout?