The USPOP2002 collection was collected by the Laboratory for the Recognition and Organization of Speech and Audio (LabROSA) at Columbia University. It consists of 8,764 tracks spanning 400 artists and 706 albums representing the top-selling artists of 2002. This collection was slightly supplemented at IMIRSEL with the addition of 291 Heavy Metal and Dance/Electronic tracks of the same era to round out the genre distributions. More information can be found here.
The USCRAP collection was collected by IMIRSEL through the purchase of a collection of remaindered CD's. The collection consists of albums and singles. It contains 4,044 tracks from 241 artists. It is predominantly Rock, Dance/Electronic, Pop, and Rap/Hip-Hop music.
The CLASSICAL collection consists of the works of 11 composers: Bach(complete works), Beethoven, Brahms, Chopin (complete works), Dvorak, Handel, Haydn, Mendelssohn, Mozart (complete works), Schubert, and Vivaldi. In total there are 9,969 tracks.
The AMERICANA collection consists of a collection of traditional Blues, Jazz, Big Band, and older Country/Western Music. The collection contains 5,291 tracks from 658 artists.
The LATIN collection was contributed by Carlos Silla and consists of Latin popular and dance music sourced from Brazil. It spans 10 genres including: Axé, Bachata, Bolero, Forró, Gaúcha, Merengue, Pagode, Sertaneja, and Tango. This collection contains a total of 3,228 tracks. More information can be found here.
The JAMENDO collection is a music platform and community. All music on Jamendo is free to download and licensed through one of several Creative Commons licenses or the Free Art License, making it legal to copy and share, as well as to modify and make commercial use of for some, depending on the license. Jamendo allows streaming of all of its thousands of albums in either Ogg Vorbis or MP3 format, and downloads through the BitTorrent and eDonkey networks. The name is a portmanteau of two musical terms: "jam" and "crescendo". There are more than 32,000 albums, 17,000 artists, and 210,000 tracks available for download. Jamendo widely varied music genres and styles include: Dance/Electro, Hip-Hop, Metal, Jazz, Lounge, Pop/Songwriting, and Rock. We obtained the entire Jamendo collection by using the special interface, released in April 2008, that allows you to search for MP3 and Ogg Vorbis torrents. More information can be found here.