While I never made orchestral library music, I think it is safe to assume that the experiences I made within a pop/electronic context are valid here, too.
The length of the "main" composition may vary a lot, although I'd stay in a 3 to 5 minutes time-frame. Even if someone needs more, he can edit out of the versions I will mention below. Make sure to give the user some good edit-points to cut out shorter versions.
From the main-version, it is a good idea to arrange sub-versions of the same length. For example, this could be a "lighter" version without strong melodies, a version relying on the string-section only, or mainly on percussion.
Starting from this pool, you should derive versions that fit into a rigid time-scheme. I'd suggest 60", 30", 15", although the preferences seem to vary from label to label. These limits should be respected religously.
Apart from that, it is very usefull to supply dedicated "hits", "stings", "bridges", "links" and so on, all in the 3 to 10 seconds range. As your arrangements will be virtual, this should pose no logistical problem (... it was one when people had to work with large orchestras).
HTH,
The length of the "main" composition may vary a lot, although I'd stay in a 3 to 5 minutes time-frame. Even if someone needs more, he can edit out of the versions I will mention below. Make sure to give the user some good edit-points to cut out shorter versions.
From the main-version, it is a good idea to arrange sub-versions of the same length. For example, this could be a "lighter" version without strong melodies, a version relying on the string-section only, or mainly on percussion.
Starting from this pool, you should derive versions that fit into a rigid time-scheme. I'd suggest 60", 30", 15", although the preferences seem to vary from label to label. These limits should be respected religously.
Apart from that, it is very usefull to supply dedicated "hits", "stings", "bridges", "links" and so on, all in the 3 to 10 seconds range. As your arrangements will be virtual, this should pose no logistical problem (... it was one when people had to work with large orchestras).
HTH,
/Dietz - Vienna Symphonic Library