I am looking for a way to print an articulation made of the combination of an accent (>) and a tenuto (_) of course if I put <a \tenuto \accent> I get an ugly result where the accent is much wider than the tenuto.
If it's not yet the case these articulations http://www.dolmetsch.com/musictheory21.htm should be added as entities. As the already existing tenuto + staccato.
Else, the documentation should mention it.