Without explaining the reasons, take this as your guide for quoting from poetry or music. Never quote from them without permission. Here's an online source you can check.
If you quote from the Bible, again, read the copyright page; however, most publishers are quite liberal in the number of verses you can use—providing you cite the translation. (It's free advertisement for the publisher.)
One other important fact is the public domain. If you cite anything, including poetry and music that was copyrighted before 1923, you're safe. Even so, I like to footnote it with "in the public domain."
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Cecil Murphey's Writer to Writer Conference will take place January 16-18, 2015, at the Hershey Lodge in Hershey, PA, prior to the Munce Group Christian Product Expo (CPE). Faculty includes Cec, Jerry Jenkins, and Shawn and Suzanne Kuhn (SuzyQ). For more information, visit www.writertowriter.com.