Filtering means manipulating audio with EQ or Filter-effects as dramaturgic tool in a pop song.
The effect can be applied on single instruments, instrument groups or a complete mix. Usually it is done by slowly opening or closing a filter / high frequencies.
1978 - Raydio "Jack And Jill". This example shows the early use of using filter sounds in pop music.
1998 - Madonna "Frozen". Filtering of drum sounds
2010 - Katy Perry "California Gurlz". Filtering of the rhythm section.
2010 - Owl City "Fireflies". Noise Filtering and telephone voices
2012 - Justin Bieber "As Long As You Love Me". Noise and Synthesizer filter effects.
2013 - Avicii "Wake Me Up". Filtering the acoustic guitar and instrumental sections.
2014 - Eminem feat. Rihanna "The Monster". Slow filter effects on the piano track.
2014 - Imagine Dragons "Demons".Very short effect on the drums, cutting high frequencies.
2014 - Ellie Goulding "Burn". Filter effcts on the lead synth and the vocal delay.
Logic 9 Tutorial showing the use of high pass filters