The Mellotron Group

The Vaughan Williams / Thomas Tallis piece is beautiful, start to
finish.  Those voices work well together.  Choir in place of the
string section may have worked nicely too.
http://www.mikedickson.org.uk/mellotronworks/
Quite complex 3/4 of the way through.  

There's a Richard Wagner piece that would suit 'tron voices well like
this.  I'll try to find it.