lipslur.com

Play along with professional musicians. Sheet music at lipslur.com.  
Here is the list of guest artists: 
Douglas Yeo - Boston Symphony (retired) - bass trombone
Jeremy Wilson - Vanderbilt University, formerly Vienna Philharmonic - trombone
Sarah Paradis - Mirari Brass Quintet - trombone
Jessie Thoman - Mirari Brass Quintet - french horn
Stephanie Frye - Mirari Brass Quintet - tuba
Alex Knoppe - Mirari Brass Quintet - trumpet
Matt Vangjel - Mirari Brass Quintet - trumpet
Terry Schwartz - Wheaton College - trumpet