QUOTE(i_love_music @ Jul 22 2005, 04:21 PM)
sounds like horn is really worth playing...............but i do need much investment in order to enjoy the beautiful side of it....=P by the way, is horn only play notes in treble clef? and is trombone only on bass clef? i think i read treble clef better than bass so maybe its one of the factor of choosing an instrument...
i think my arms are quite long, so i may become a suitable trombone player!~
Horn players need both treble and bass clef, and have to interpret bass clef in two different ways: in modern music, the relationship between treble and bass clef is what one would expect, but in the early days of the horn, notes in bass clef were written an octave lower than you would expect. The most recent music in "old notation" that I know is the "Four last songs" of Richard Strauss, c.1947. These are also old-fashioned in being written for horns in other keys than F. Horn players need to know several transpositions.
Trombone players in brass bands sometimes play from transposing treble clef, so that they can also play euphonium or baritone parts, but in other ensembles they play from concert pitch parts. Before about 1840, when trombones of three different sizes, alto, tenor and bass, were the norm, the clef indicated which instrument the composer expected the player to use. During the later 19th C, composers, especially French ones, started using different combinations of trombones, so that by 1900 the norm in the UK was to find two tenors and a bass in most symphonic scores (though e.g. Debussy often wanted three tenors) and the clefs are no longer a reliable indication of which instrument is to be used. Coincident with the advent of the plug trombone, in the middle of the 20th C, bass clef became popular for all trombone parts among some composers: I don't know whether the different instrument influenced this or whether it was just a coincidence. Anomalies persisted, however. For instance, in his 10th symphony (1953), Shostakovich uses alto clef for his upper two trombones, but AFAIK he expected these parts to be played on tenors.