Lancaster left the band in April 2007, Lenzo and Bundrick filled in for Lancaster's vocals, while Garcia and Betts performed Lancaster's guitar parts. Garcia said this change made the guitars "sound more clear" and not "clutter[ed]"; on the other hand, the group found it hard working out who should sing Lancaster's parts. On April 4, "Black Cat" was made available for streaming via
Hot Topic's
Myspace profile. On April 13, the release of
A Lesson in Romantics was announced. Between early May and late June, the band went on tour with support from
Bedlight for Blue Eyes,
Driver Side Impact, and Sick City. The track listing was revealed on May 18. On June 6, the band made "
When I Get Home, You're So Dead" available for streaming via their Myspace profile. "
Jamie All Over" was made available for streaming on June 19, via
AbsolutePunk.
A Lesson in Romantics was made available for streaming through
AOL, and was released the following day through Fearless Records. Mayday Parade appeared at Dirt Fest in Birch Run, Michigan, before touring as part of the 2007 edition of Warped Tour from mid July to early August. In August, the band went on tour with Olympia and Sound the Alarm. The music video for "When I Get Home, You're So Dead", directed by Marco de la Torre, was filmed in September. In late September 2007, the band supported
Paramore in Japan and Australia. The band went on a co-headlining tour with Madina Lake in October and November. The "When I Get Home, You're So Dead" music video was released on November 14, and the single was released on December 3. The band went on the Manwhores and Open Sores Tour alongside
All Time Low,
Every Avenue, and
Just Surrender in January 2008. Between late January and late March, the band went on a
package tour alongside
Emery,
As Cities Burn,
Pierce the Veil and
Cry of the Afflicted. In April and May, the band went on the Explosions In Your Pants Tour with support from My American Heart and the Graduate. A music video was filmed for "Jamie All Over" in May, and the single was released on May 20. Mayday Parade went on the 2008 edition of Warped Tour, playing all summer-long for the first time. through MTV on July 21. The song was released to radio on September 2. In October and November, the band supported All Time Low on the Compromising of Integrity, Morality, & Principles in Exchange for Money tour. A music video for "
Miserable at Best", directed by Mark Staubach, was released on January 9, 2009, on the band's Myspace.
Reissues A Lesson in Romantics was reissued on April 28, 2008, featuring an acoustic version of "Three Cheers for Five Years", as well as "One Man Drinking Games". A white vinyl edition was released a year later, on August 28, 2012. On January 1, 2017, the band launched a website under the name, alessoninromantics.com, teasing a 10 year anniversary tour for the album. On January 27, a new music video was released for "Black Cat", directed by Max Moore. A 10th anniversary edition of the album featuring demos was released on March 17. A UK leg of the tour is set to take place in September. The band also did commentary for every track on the album. Producer Kenneth Mount criticized the band on
Twitter for not giving Lancaster credit in commentary, "I'm slightly confused why mayday parades commentary for lesson in romantics never mentions Jason Lancaster at all, voice of 50% of the album... Jason also recorded all his vocals naked for a lesson in romantics , that should totally make the commentary. I've waited ten years for that". ==Reception and legacy==