2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221213I review the properties of mesons with one heavy quark. I start by examining the predicted masses and widths in the context of the quark model and heavy quark effective theory. Some recent experimental results are described and I conclude with comments on potentially interesting future experimental studies.LaTex file uses aipproc.sty, epsfig, and rotating. 6 postscript figures are attached. Invited plenary talk at the 7th International Conference on Hadron Spectroscopy, Brookhaven National Laboratory, August 25-30, 1997High Energy Physics - Phenomenologytext