One of my favorite TV series for children is Little Einsteins. This is simply brilliant and so enjoyable, especially due to the music and of course the fact that the children are able to learn a lot while watching.
If you want to let your children see some great stuff tonight, why not let them watch Little Einsteins? It can be watched online on Amazon as an Instant Video, or you can of course buy it on DVD or so on.
This is totally enjoyable so I hope not only your children while enjoy watching Little Einsteins, but maybe you will do so as well. And you should know that every episode has a subject and a famous piece of music which can be heard throughout the entire episode and thus the children will get to know more about the composer, recognize a famous classic piece of music and learn a lot of stuff as well while watching!
Go ahead and watch Little Einsteins on Amazon and do not forget that if you decide to watch Little Einsteins on Amazon.de then the characters will speak German since all content are dubbed in Germany. But, on Amazon.com and Amazon.co.uk they will of course speak English!