- Maayani, Ami
- MacCunn, Hamish
- MacDowell, Edward Alexander
- Mace, Thomas
- Maceda, José
- Macfarren, George Alexander, Sir
- Macfarren, Walter Cecil
- Machaut, Guillaume de
- Mackenzie, Alexander Campbell, Sir
- MacMillan, Ernest Alexander Campbell, Sir
- MacMillan, James
- Maconchy, Elizabeth, Dame
- Macque, Giovanni de
- Maderna, Bruno
- Maderna, Osmar Héctor
- Madetoja, Leevi Antti
- Maegaard, Jan Carl Christian
- Maessens, Pieter
- Magle, Frederik
- Magnard, Lucien Denis Gabriel Albéric
- Mahler, Alma Schindler
- Mahler, Gustav
- Maier, Michael
- Maklakiewicz, Jan Adam
- Malawski, Artur
- Malec, Ivo
- Malipiero, Gian Francesco
- Malling, Otto Valdemar
- Malvezzi, Cristofano
- Mamangakis, Nicos
- Manchicourt, Pierre de
- Mancinelli, Luigi
- Mancini, Francesco
- Mancini, Henry
- Manfredini, Francesco Onofrio
- Manfredini, Vincenzo
- Manziarly, Marcelle de
- Manzoni, Giacomo
- Marais, Marin
- Marcello, Alessandro
- Marcello, Benedetto
- Marchetto da Padova
- Marenzio, Luca
- Mariani, Angelo Maurizio Gaspare
- Mariétan, Pierre
- Marini, Biagio
- Marino, Carlo Antonio
- Marinuzzi, Gino, Jr.
- Marinuzzi, Gino, Sr.
- Markevitch, Igor
- Maros, Miklós
- Maros, Rudolf
- Marpurg, Friedrich Wilhelm
- Marsalis, Wynton
- Marschner, Heinrich August
- Marsh, John
- Marshall, Ingram
- Marshall-Hall, George William Louis
- Martin, Frank
- Martinez, Odaline de la
- Martini, Giovanni Battista, Padre
- Martini, Johannes
- Martini, Johann Paul Aegidius
- Martino, Donald James
- Martinon, Jean
- Martinů, Bohuslav Jan
- Martín y Soler, Atanasio Martín Ignacio Vicente Tadeo Francisco Pellegrín
- Martirano, Salvatore Giovanni
- Martucci, Giuseppe
- Marx, Adolf Bernhard
- Marx, Joseph
- Marx, Karl
- Masaoka, Miya
- Mascagni, Pietro
- Maschera, Florentio
- Mason, Daniel Gregory
- Mason, Lowell
- Massé, Victor
- Massenet, Jules Emile Frédéric
- Mata, Eduardo
- Mather, James Bruce
- Matheus de Sancto Johanne
- Mathews, Max Vernon
- Mathias, William James
- Matsudaira, Yoritsune
- Matteis, Nicola the Elder
- Matteis, Nicola the Younger
- Matteo da Perugia
- Mattheson, Johann
- Matthews, Colin
- Matthews, David
- Mauduit, Jacques
- Mauersberger, Rudolf
- Maw, John Nicholas
- Maxwell Davies, Peter
- May, Frederick
- Maynard, John
- Mayone, Ascanio
- Mayr, Johann Simon
- Mayuzumi, Toshirô
- Mazzinghi, Joseph
- Mazzocchi, Domenico
- Mazzocchi, Virgilio
- Mazzucato, Alberto
- McCabe, John
- McEwan, John Blackwood, Sir
- McGibbon, William
- McPhee, Colin Carhart
- Meale, Richard Graham
- Mechem, Kirke
- Medtner, Nikolai Karlovich
- Meester, Louis August Edmond Hendrik de
- Méfano, Paul
- Méhul, Étienne-Nicolas
- Mellers, Wilfrid Howard
- Melli, Domenico Maria
- Mellnäs, Arne
- Mendelssohn, Arnold Ludwig
- Mendelssohn-Bartholdy, Jakob Ludwig Felix
- Mendelssohn Hensel, Fanny Cäcilie
- Mengelberg, Josef Willem
- Mengelberg, Karel
- Mengelberg, Kurt Rudolf
- Mengelberg, Misha
- Menotti, Gian Carlo
- Messiaen, Olivier
- Meyerbeer, Giacomo
- Mikołaj z Radomia
- Milhaud, Darius
- Minkus, Ludwig
- Moeran, Ernest John
- Molter, Johann Melchior
- Monteverdi, Claudio Giovanni Antonio
- Moondog
- Moore, Douglas Stuart
- Moore, Undine Smith
- Moravec, Paul
- Morley, Thomas
- Morricone, Ennio
- Mozart, Franz Xaver Wolfgang
- Mozart, Johann Chrysostom Wolfgang Amadeus
- Mozart, Johann Georg Leopold
- Mumma, Gordon
- Munro, Ian
- Musgrave, Thea
- Mussorgsky, Modest Petrovich
- Myaskovsky, Nikolai Yakovlevich
- Møller, Peter
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- 57