Here is my formula for determining my favorite bands:

• Number of Albums owned – 30%
• Minutes spent listening to the band – 20%
• Average rating per song – 20%
• Total number of listens to their songs – 15%
• Average rating per album – 10%
• Total number of songs owned – 5%

The formula definitely punishes short brilliant careers, but that probably makes sense when determining all time favorite band.