Final answer:
The statement is false; Classical-era concertos were typically written for a solo instrument and orchestra, with the practice continuing from the Baroque period.
Step-by-step explanation:
The statement that Classical-era concertos were typically only written for a solo group and orchestra is false. While it is true that the Baroque concerto often featured a solo instrument or a group of soloists accompanied by an orchestra, this practice did not change significantly during the Classical period. Composers like Mozart and Haydn continued to write concertos for a solo instrument and orchestra, a practice that was further developed by Beethoven. The Classical concerto typically highlights one solo instrument that is accompanied by an orchestra.