There are many types of music stands available, from the old wire fold-able stands that are reminders of middle school band practice, to dual shelf plexiglass thrones.  Their are three types of music stands when it comes down to it;

Trigger locks: These stands have their height controlled by a trigger lock just under the music holder.  These are a personal favorite because they are easy to use, can hold a lot of weight, and never seem to loose their ability to hold to the weight.  read more »