Bolide ⌡Self Appointed Pastor⌠
This has been done with steel string acoustics, in fact Gibson offers a John Lennon tribute model today in this manner, but will not work with a classical guitar as the nylon strings will not interact with the magnetic field of the pickup. A proper bridge pickup for a classical guitar can be installed quickly by a competent luthier/guitar repaiman (or any knowledgeable woodwright) for a modest price.

Rach
yea but it wouldnt sound the same as it would on an electric acoustic guitar it will sound totally different depending on the song

LucasMan
You may get a signal from the wound strings, but not the bare nylon ones. So no, it won't work. You can buy an acoustic guitar pickup that measures the vibrations in the wood. Those will work.