[_cipher_]

Probably doesn't matter as a comment (there are so many great comments expanding way more), but when all classical composers composed music, they didn't assume something like "Tempo: 70bmp". They were referring to it as "Adagio" (same for other tempos, see here for reference http://en.wikipedia.org/wiki/Tempo#Basic_tempo_markings ).

That gives the conductor the freedom to play with the tempo (example: one conductor may decide that a specific part noted as "Allegro" is better sounded at 120bpm, an other one at 125bpm which may give a little more aggressive touch), giving the audience a much more pleasing experience.