As we are now between Rosh Chodesh Iyar and Lag Ba’Omer (La’Omer ?), I think that everyone agrees that it is a period of mourning.
That said, there are those who allow listening to recorded music as long as it’s not live. That is probably a minority among the Yeshiva World crowd. I think that there are 3 levels:
1) those who listen to any recorded music
2) those who listen to Accapela
3) those who don’t listen to any music
There are some in between levels of people who listen to accapela provided that it is “Dveykus” type songs that are uplifting spiritually but do not lead to dancing or kallus rosh. Perhaps some of these people will even listen to regular recorded music if it is these type of songs.