It is not the kind of stuff I usually post, but I have been really impressed with this site (even more after I found out it´s not called Music Ovary, as I had originally been told). The interface allows you to create a custom playlist based on time range (everything before 1950 seems to be lumped together) , genres and degrees of mood (light-dark, energetic-chill). The only thing I don´t like (or maybe I just haven´t invested enough time to figure it out) is how to queue lists so it doesn´t stop playing.