for a certain type of music. It could be waltz, bossa-nova, rock, calypso, keroncong, country or whatever. It would not be smooth to play a piece and when it ends then start looking for another song from the file or book.
The advantage I think we had was my repertoire for song types is actually quite wide...and so could do almost any type of songs asked for.
Many could not "tahan" and rush to the Mic to join in the singing of their old time favourites.