MediaJoin 

Easily join / combine all popular audio and video formats into a single merged file. Formats supported include MP3, WMA, WAV, OGG, AVI, MPEG-1, MPEG-2, and WMV. Optionally include audio tag information for the combined output audio file.
joiner combiner audio joiner video joiner mp3 joiner wma joiner wav joiner avi joiner mpg joiner mpeg joiner wmv joiner combine audio combine video combine mp3

#1 MP3 Cutter Joiner 

MP3 Cutter Joiner is a powerful and easy-to-use audio editor, which builds audio cutter and joiner into one. Supports MP3, WAV, WMA and OGG format. Supports batch cutting. Cutting/joining in high precision and no quality is lost!
mp3 cutter joiner mp3 cutter mp3 splitter mp3 joiner mp3 combine wma cutter joiner wma cut wma split wma join wav cutter joiner wav cutter wav joiner wav combine