Here is a list of web sites that the staff at ConcertinaMusic.com frequently visit and find useful and entertaining. 

Concertina Information

Center for the Study of Free Reed Instruments
Chemnitzer Concertina Information Site (Tony Schaeffler)
Classical Free-Reed, The (Henry Doktorski)
Concertina.com (Robert Gaskins)
Concertina.info (Chris Timson)
Concertina.net (Paul Schwartz)
Concertina.nl (Pauline de Snoo)
Concertina Appreciation Site (Dan Melander)
Concertina Connection (Karen and Wim Wakker)
Concertina Magic - MIDI Conversion (Roy and Peter Whiteley)
Concertina Novice, The (Ted Kloba)
DoN Nichols' Home Page (DoN Nichols)
Kochanski's Concertina Beer Hall (Andy Kochanski)
South African Boer Music (Sean Minnie)
Steve's Polka Page (Steve Litwin)
Yahoo! Chemnitzer Concertina Discussion Group

Concertina Sales and Repair

AccordionHeaven.com
Castiglione Accordion
Dan Gruetzmacher's Web Page (Dan Gruetzmacher)
Eagle Concertina (Rich Raclawski)
Harry Geuns Bandoneon and Concertina Maker (Harry Geuns)
Homewood Musical Instruments (Bob Tedrow)
Prairie Instrument Works (Ted Kloba)
Scott's Concertina Sales and Repair (Scott Majeski)

Recording Artists

Buffalo Concertina All-Stars
Gulf Coast Playboys (Bradley Jaye Williams)
Jim Busta Band (Jim Busta)
Mike Schneider Band (Mike Schneider)
Pádraig Rynne (Pádraig Rynne)
Polka Dan (Dan Zantek)
Squeezebox (Ted Lange)

Recorded Music

Bel-Aire Records
Ernie Coopman - The Complete Collection
Jay Jay Records (Li'l Wally Jagiello)
Jimmy K Polkas (Jimmy Krzeszewski)
PolkaConnection.com
Polkamart
Whoopee John - Vintage Recorded Music

Sheet Music (For Fee or Free)

Accordionist.net
Brown's Music
Easy Squeezy Tunes for Accordions and Concertinas (Wendy Morrison)
Free Scores, France
FreeSheetMusic.net
Hazel Leach: Composer
Musica Viva, Norway
My Sheet Music
Odd Realm
Old Time Concertina (Chris Weiss)
Rain Music
Sheet Music Man (Joe Sampson)
Sheet Music Now
Sheet Music Online
Virtual Sheet Music

Concertina Clubs

Cicero Concertina Circle
Czech Area Concertina Club
International Concertina Association - ICA

Audio and Video

247PolkaHeaven.com
PolkaBarn.com
PolkaPartyExpress.com (WMNF 88.5 FM - Tampa, Florida)
PolkaVideos.com
TheJammer.org

Other Related Sites

1st In Harmonicas
AccordionLinks.com
CyberPolkas.com
Dance-A-Polka Day Greeting Cards (123Greetings.com)
Felix and Stella's Polish Style Dance Calendar
FolkLib Index - Wisconsin Polka Bands
FolkLib Index - Wisconsin Discography
Harmonicas And Stuff (Chris and Helen Bowser)
ItsPolkaTime.com (Craig Ebel)
Let's Polka - An Accordion Blog (Anna and Chris Saccheri)
Polish American Journal - Polka News
Polka Editor
Polka Memories (Jimmy Krzeszewski)
Polka Showcase (Judy Stringhill and Jimmy Soldridge)
Polonia Today
Accordion-Search.com
United States Polka Association - USPA
Wisconsin Polka Music (Tom Brusky)
World Wide Polkas (Thomas Gagnon)