i use to use excell for my song book. i used the custom assembly and typed all my stuff in.
i recently had to redo all my books and changed to using the book ID, i am so glad i switched. i would never go back to using the excell sheet.
i agree the excell sheet had its Advantages but typing in one number is way better. and having the artists songs all together in alpha order is sweet. granted i had to go through all my songs and spell everything correctly (took one full day) but was well worth it.
hope this helps
