Fifteen years ago today, on September 11th, a series of coordinated attacks were brought on by Islamic terrorist group, al-Qaeda, starting first with the devastation of the World Trade Center in New York and continuing with the Pentagon in DC. Between these two attacks, over 3,000 people were killed including responding firefighters, paramedics, and police officers. Only six individuals survived the attack on the World Trade Center.

Tuesdays of every week are when music stores usually receive new music and releases from top artists, but the music industry hit a large snag. Following the attacks, music sales dropped; musicians like N’Sync struggled with record sales, songs were banned, and tours were canceled.

Despite the minor hurdles in the industry, musicians such as Stevie Wonder, Faith Hill, Bruce Springsteen, and Alicia Keys all came together on September 21st to take part in a telethon known as America: A Tribute to Heroes. The musicians performed together in front of the surviving members of New York Police, firefighters, paramedics and families of those who died in the attacks. They raised $150 million for United Way as a result.

In the wake of performances like the collaboration with America: A Tribute to Heroes, some of our greatest musicians are still voicing how the attacks impact them today. Musicians like Kiss, Willie Nelson, Diplo, The Black Eyed Peas are more are coming forward to express their heartfelt sentiments over social media. See their tributes below.