There may be a number of reasons why some artist are shelved.
One reason may be that the artists may have been very similar to what the label had previously signed and to ensure little competition the label signed the new artist without any real intention of releasing the artist. Another reason may be that the artist upset someone at the label, say someone in the marketing department. Additionally, the artist's team may not be very aggressive in ensuring that the artist project not get shelved. The team may be management or legal.
The Music Industry Connection Book Series has a list of contacts and resources to assist you in building the right team and going the extra mile.
MORE MUSIC BUSINESS BLOGS
Music Business Promotions
Africa's Music Business Grows
Real Music Business Education
Music Business Videos
Music Business Economy
Music Business Career Goals
Passing Up Music Business Money
Music Business Remember Me
Truth about Music Conferences
Saving the Music Business
Are You in the Music Business?
5 Music Business Mistakes by Kevin Black
Music Business Profit Don't Be Ashamed
Music Business Trends, Does Music Suck?