21531 Rar -

If you are looking to "put together" the piece—likely meaning extracting or playing the music—you would typically need:

: Once extracted, the files (usually in .flac , .wav , or .mp3 format) can be played in any standard media player. Comiket 93 | Doujin Music | ВКонтакте - VK 21531 rar

This file is part of a music collection from , a major doujin music and culture event. The track "Star Piece!" is the 10th track on the album Diverse System - DEPTH (catalogue number DVSP-0196) and is also featured on the album Star Piece! (catalogue number YTCD-0012). If you are looking to "put together" the

Based on the information provided, likely refers to a compressed archive associated with the track "Star Piece!" by the artist you (also known as YUDUKI). (catalogue number YTCD-0012)

: Software like 7-Zip or WinRAR to open the .rar file.